{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T09:54:34Z",
    "providers": [
      "Codex"
    ],
    "breadth": "recalled by Codex without web access - no source was read",
    "missingProviders": [],
    "pass": 2,
    "cost": {
      "grok": {
        "seconds": 22.9,
        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09509-1639-77b1-9a62-9370973789f9\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: fulvic acid\nSense to describe: (none recorded)\nDomain code: PHY.MAT\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 043: 1001 reg",
        "usd": 0.0,
        "recall": true
      },
      "codex": {
        "seconds": 79.4,
        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a09509-1628-7c01-bef8-674b45ec074f\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: fulvic acid\nRegistry id: vr.tr.fulvic-acid\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\n"
      }
    },
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T12:00:00Z",
      "ingestedAt": "2026-10-06T08:59:44+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "failure_modes_and_hazards",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-09T07:30:04+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q909033",
    "registryId": "vr.tr.fulvic-acid",
    "name": "fulvic acid",
    "version": "0.1.0-research.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.MAT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q909033/",
  "model": {
    "registry_id": "vr.tr.fulvic-acid",
    "name": "fulvic acid",
    "purpose": "Enable an agent to identify a fulvic-acid material, assess its composition and condition, and judge whether evidence supports a proposed use.",
    "definition": "Fulvic acid is an operationally defined, heterogeneous fraction of humic substances that remains soluble in water after acidification to about pH 1, rather than a single compound with a fixed molecular structure.",
    "scope_statement": "This model owns fulvic acid as an operationally defined, heterogeneous fraction of humic substances, including the provenance, separation method, analytical evidence and batch condition needed to interpret that identity; it does not presume a single molecular structure or uniform commercial composition.",
    "in_scope": [
      "Operational identity and distinction from humic acid, humin and broader dissolved organic matter",
      "Source material, extraction, fractionation and purification history",
      "Batch composition, organic-carbon content, inorganic residues and contaminants",
      "Solubility, acidity and interactions with metals under stated conditions",
      "Storage condition, analytical comparability and fitness for a specified use"
    ],
    "out_of_scope": [
      "Complete soil, peat, sediment or aquatic ecosystems from which the material originates",
      "Finished fertilizers, supplements and other formulations containing fulvic acid",
      "Extraction equipment and production-process design",
      "Humic acid and humin as independently managed material fractions",
      "Clinical outcomes, crop performance and environmental remediation projects"
    ],
    "distinguishing_features": [
      "Determine whether the material remains in solution during a documented acidification procedure that separates precipitating humic acid; record the pH and separation conditions.",
      "Require evidence that the material is an isolated or quantified fulvic fraction rather than total dissolved organic matter bearing a fulvic-acid label.",
      "Distinguish the heterogeneous fraction from a pure compound: a name or registry identifier alone does not establish one molecular formula, molecular mass or structure.",
      "Distinguish fulvic-acid content from water, ash, salts and other organic matter in commercial powders or solutions.",
      "Treat color, fluorescence and carboxyl-group signals as supporting observations whose specificity must be established, rather than sufficient identity tests."
    ],
    "characteristics": [
      {
        "name": "Operational identity",
        "kind": "category",
        "unit_or_values": "Named isolation or analytical method, version and acceptance criteria",
        "why_it_matters": "The measured fraction depends on how fulvic acid is separated and identified."
      },
      {
        "name": "Source and batch lineage",
        "kind": "relation",
        "unit_or_values": "Source matrix, collection location or supplier, extraction batch and sample identifiers",
        "why_it_matters": "Materials with the same label may differ with source and processing."
      },
      {
        "name": "Reported fulvic-acid content",
        "kind": "measurement",
        "unit_or_values": "% by mass with analytical method and as-received, dry or ash-free basis",
        "why_it_matters": "A percentage cannot support comparison or dosing without its method and denominator."
      },
      {
        "name": "Organic-carbon content",
        "kind": "measurement",
        "unit_or_values": "mg C/L for solutions or % C by mass for solids, with method",
        "why_it_matters": "Carbon-normalized comparisons can be more interpretable than comparisons using total product mass."
      },
      {
        "name": "Moisture and ash",
        "kind": "measurement",
        "unit_or_values": "% by mass for each, with drying and ignition conditions",
        "why_it_matters": "Water and inorganic residues affect apparent yield, composition and usable material content."
      },
      {
        "name": "Acidity and charge behavior",
        "kind": "measurement",
        "unit_or_values": "pH at specified concentration; titratable acidity in mmol/g or mmol/g C with protocol",
        "why_it_matters": "Acid-base behavior affects solubility, metal binding and compatibility."
      },
      {
        "name": "Apparent size distribution",
        "kind": "measurement",
        "unit_or_values": "Method-dependent distribution with calibration, eluent, pH and ionic strength",
        "why_it_matters": "A heterogeneous fraction should not be represented by an unsupported single molecular mass."
      },
      {
        "name": "Metal association",
        "kind": "measurement",
        "unit_or_values": "Metal identity, total and operationally free concentrations, binding conditions and model",
        "why_it_matters": "Metal association can affect both intended function and contaminant mobility."
      },
      {
        "name": "Contaminant profile",
        "kind": "measurement",
        "unit_or_values": "Analyte-specific mg/kg or mg/L, reporting basis, detection limits and method",
        "why_it_matters": "Source-derived or process-derived contaminants can constrain use independently of fulvic-acid content."
      },
      {
        "name": "Physical and storage condition",
        "kind": "state",
        "unit_or_values": "Solid or solution; concentration, precipitation, container, storage conditions and observation date",
        "why_it_matters": "Changes during storage may invalidate earlier measurements or alter handling."
      }
    ],
    "affordances": [
      "Classify a sample against a documented fulvic-fraction definition and identify missing identity evidence.",
      "Compare batches after aligning analytical methods, carbon content and reporting bases.",
      "Select characterization tests that distinguish fulvic material from salts and accompanying organic fractions.",
      "Evaluate compatibility with a specified pH, electrolyte composition or metal-containing mixture.",
      "Accept, quarantine or reject a batch for a stated use using applicable specifications and measured contaminants.",
      "Define handling and storage instructions from the actual batch composition and supporting documentation."
    ],
    "agent_conduct": {
      "may": [
        "Explain what fulvic acid is and its role in soils and natural waters, with sources.",
        "Note that fulvic acid is a mixture defined by how it is extracted, not one compound."
      ],
      "must_not": [
        "Promote fulvic acid supplements as cures or present unproven health claims as fact.",
        "Present one product's fulvic acid content as comparable with another's without the method named.",
        "Recommend doses for people or animals."
      ],
      "requires_human": [
        "Advising a person who wants to take fulvic acid for a medical condition."
      ]
    },
    "ethics": {
      "considerations": [
        "Health marketing of humic products can mislead sick people into spending money or delaying care."
      ],
      "affected_parties": [
        "Consumers of supplements",
        "Farmers",
        "Patients"
      ]
    },
    "owners": {
      "steward": "Nobody owns the natural fraction; makers of products answer for their labels.",
      "master_systems": []
    },
    "failure_modes_and_hazards": [
      "Fulvic substances in water can react with disinfectants to form unwanted by-products.",
      "Unregulated supplements may contain contaminants."
    ],
    "what_it_is_for": [
      "Fulvic-acid fractions are studied in soils, sediments and natural waters to understand organic matter and its interactions with minerals and dissolved substances.",
      "They also occur in agricultural materials, where composition and analytical evidence help assess claims about soil conditioning or nutrient availability."
    ],
    "standards_and_regulation": [
      "ISO 19822, issued by the International Organization for Standardization, specifies determination of humic and hydrophobic fulvic acid concentrations in fertilizers and soil conditioners."
    ],
    "visual_identification": [
      "Dilute aqueous fractions often appear yellow to brown, but color alone does not establish identity.",
      "Concentrated or dried materials can appear dark brown and resemble other humic materials.",
      "A clear brown solution can resemble many unrelated organic mixtures, so analytical characterization is needed to distinguish the material."
    ]
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q909033: fulvic acid",
      "url": "https://www.wikidata.org/wiki/Q909033",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Fulvic acid",
      "url": "https://en.wikipedia.org/wiki/Fulvic_acid",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "fulvic-fraction-identity",
        "name": "Fulvic fraction identity",
        "description": "Establish what the fulvic-acid designation means for the material and what evidence supports it.",
        "rationale": "Fulvic acid requires an operational identity rather than an assumed pure-compound identity.",
        "layers": [
          {
            "id": "operational-separation",
            "name": "Operational separation",
            "description": "Capture the procedure distinguishing the fulvic fraction from accompanying humic substances.",
            "findings": [
              {
                "id": "acid-soluble-fraction",
                "name": "Acid-soluble fraction",
                "description": "Record the separation evidence and conditions used to assign the fulvic-acid designation.",
                "questions": [
                  {
                    "text": "Which operational definition and fractionation procedure establish that this material is fulvic acid?",
                    "kind": "definition",
                    "id": "acid-soluble-fraction-q01"
                  },
                  {
                    "text": "At what pH, concentration, temperature and equilibration time was separation from precipitating humic material evaluated?",
                    "kind": "measurement",
                    "id": "acid-soluble-fraction-q02"
                  },
                  {
                    "text": "How were humin, residual humic acid and non-fulvic dissolved organics excluded or quantified?",
                    "kind": "boundary",
                    "id": "acid-soluble-fraction-q03"
                  }
                ]
              }
            ]
          },
          {
            "id": "label-and-material-boundary",
            "name": "Label and material boundary",
            "description": "Separate the registered material concept from supplier terminology and formulated products.",
            "findings": [
              {
                "id": "identity-claim-coverage",
                "name": "Identity claim coverage",
                "description": "Determine whether identifiers and labels describe the isolated fraction, a salt-containing preparation or an entire product.",
                "questions": [
                  {
                    "text": "Does the supplied name refer to the fulvic fraction itself or to a mixture sold on the basis of claimed fulvic-acid content?",
                    "kind": "boundary",
                    "id": "identity-claim-coverage-q01"
                  },
                  {
                    "text": "Which identifiers and supplier documents apply to this exact material, and what composition do they cover?",
                    "kind": "provenance",
                    "id": "identity-claim-coverage-q02"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "source-and-isolation-history",
        "name": "Source and isolation history",
        "description": "Connect each batch to its source matrix and the operations that produced the analyzed fraction.",
        "rationale": "Source and isolation history are necessary to interpret variation between fulvic-acid materials.",
        "layers": [
          {
            "id": "source-matrix",
            "name": "Source matrix",
            "description": "Record the origin and traceability of the organic material.",
            "findings": [
              {
                "id": "feedstock-lineage",
                "name": "Feedstock lineage",
                "description": "Preserve the relationship between the sample and its originating environmental or processed material.",
                "questions": [
                  {
                    "text": "From which soil, water, peat, mineral-associated deposit or other documented matrix was this fraction obtained?",
                    "kind": "provenance",
                    "id": "feedstock-lineage-q01"
                  },
                  {
                    "text": "Can the analyzed sample be traced to a collection or feedstock lot, including any blending of origins?",
                    "kind": "provenance",
                    "id": "feedstock-lineage-q02"
                  }
                ]
              }
            ]
          },
          {
            "id": "extraction-and-purification",
            "name": "Extraction and purification",
            "description": "Capture operations that select the fraction or introduce residues.",
            "findings": [
              {
                "id": "isolation-effects",
                "name": "Isolation effects",
                "description": "Record extraction, acidification, resin separation, desalting and drying where used, with evidence of their effects.",
                "questions": [
                  {
                    "text": "Which reagents, pH conditions and separation steps produced the supplied fulvic fraction?",
                    "kind": "provenance",
                    "id": "isolation-effects-q01"
                  },
                  {
                    "text": "What evidence quantifies remaining extraction salts, reagents or co-extracted organic material?",
                    "kind": "measurement",
                    "id": "isolation-effects-q02"
                  },
                  {
                    "text": "What recovery or mass-balance evidence shows how much material was lost or selectively retained during purification?",
                    "kind": "measurement",
                    "id": "isolation-effects-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "composition-and-comparability",
        "name": "Composition and comparability",
        "description": "Characterize the organic fraction and establish valid bases for comparing samples.",
        "rationale": "A fulvic-acid percentage or fingerprint is only interpretable with its measurement method and reporting basis.",
        "layers": [
          {
            "id": "content-and-reporting-basis",
            "name": "Content and reporting basis",
            "description": "Separate measured fulvic content from carbon, water and inorganic mass.",
            "findings": [
              {
                "id": "fraction-content-accounting",
                "name": "Fraction content accounting",
                "description": "Make content claims auditable without equating total solids or total organic carbon with fulvic acid.",
                "questions": [
                  {
                    "text": "How was fulvic-acid content measured, and is the result reported on an as-received, dry or ash-free basis?",
                    "kind": "measurement",
                    "id": "fraction-content-accounting-q01"
                  },
                  {
                    "text": "What are the separately measured organic-carbon, moisture and ash contents of the same batch?",
                    "kind": "measurement",
                    "id": "fraction-content-accounting-q02"
                  },
                  {
                    "text": "Are competing supplier results comparable under the same method and denominator, or is reanalysis required?",
                    "kind": "action",
                    "id": "fraction-content-accounting-q03"
                  }
                ]
              }
            ]
          },
          {
            "id": "chemical-fingerprint",
            "name": "Chemical fingerprint",
            "description": "Represent chemical heterogeneity through complementary measurements.",
            "findings": [
              {
                "id": "functional-and-size-profile",
                "name": "Functional and size profile",
                "description": "Record evidence about acidic groups, optical properties and apparent size without asserting a unique structure.",
                "questions": [
                  {
                    "text": "Which titration or spectroscopic measurements characterize the acidic functional groups in this batch?",
                    "kind": "measurement",
                    "id": "functional-and-size-profile-q01"
                  },
                  {
                    "text": "How do sample preparation, calibration and solution conditions affect the reported optical fingerprint or apparent size distribution?",
                    "kind": "measurement",
                    "id": "functional-and-size-profile-q02"
                  },
                  {
                    "text": "Which characterized reference material supports interpretation, and what differences limit that comparison?",
                    "kind": "boundary",
                    "id": "functional-and-size-profile-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "solution-behavior-and-metal-interactions",
        "name": "Solution behavior and metal interactions",
        "description": "Describe how the characterized fraction behaves under the conditions of a proposed operation.",
        "rationale": "Fulvic-acid identity alone does not establish compatibility, binding performance or contaminant immobilization.",
        "layers": [
          {
            "id": "solution-condition-response",
            "name": "Solution condition response",
            "description": "Evaluate dissolution, aggregation and observed stability under specified conditions.",
            "findings": [
              {
                "id": "conditional-solubility",
                "name": "Conditional solubility",
                "description": "Record actual solution behavior across the conditions relevant to storage or use.",
                "questions": [
                  {
                    "text": "Does this batch remain dissolved at the intended concentration, pH, temperature and electrolyte composition?",
                    "kind": "measurement",
                    "id": "conditional-solubility-q01"
                  },
                  {
                    "text": "If turbidity or precipitation appears, what evidence distinguishes fulvic-material aggregation from inorganic precipitation or residual humic acid?",
                    "kind": "boundary",
                    "id": "conditional-solubility-q02"
                  }
                ]
              }
            ]
          },
          {
            "id": "metal-binding-and-mobility",
            "name": "Metal binding and mobility",
            "description": "Evaluate association with particular metals without assuming that binding makes them harmless or immobile.",
            "findings": [
              {
                "id": "conditional-metal-association",
                "name": "Conditional metal association",
                "description": "Connect binding measurements to metal identity, competing ions and the intended environment.",
                "questions": [
                  {
                    "text": "For the metal of interest, what total and operationally free concentrations were measured at the relevant pH and fulvic-carbon concentration?",
                    "kind": "measurement",
                    "id": "conditional-metal-association-q01"
                  },
                  {
                    "text": "Which competing ions and analytical assumptions affect the reported binding capacity or conditional binding constant?",
                    "kind": "measurement",
                    "id": "conditional-metal-association-q02"
                  },
                  {
                    "text": "Does evidence under the proposed conditions support increased transport, reduced availability or another specific outcome?",
                    "kind": "action",
                    "id": "conditional-metal-association-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "batch-release-and-use-constraints",
        "name": "Batch release and use constraints",
        "description": "Translate batch evidence into handling, storage and fitness decisions for a specified application.",
        "rationale": "A fulvic-acid label cannot establish contaminant limits, safety classification or suitability across different uses.",
        "layers": [
          {
            "id": "contaminants-and-applicable-identity",
            "name": "Contaminants and applicable identity",
            "description": "Evaluate unwanted constituents and documentation against the actual material and intended use.",
            "findings": [
              {
                "id": "batch-specific-acceptance",
                "name": "Batch-specific acceptance",
                "description": "Associate contaminant results and applicable requirements with the characterized batch.",
                "questions": [
                  {
                    "text": "Which source-derived metals, process residues or other contaminants require testing for this feedstock and intended use?",
                    "kind": "action",
                    "id": "batch-specific-acceptance-q01"
                  },
                  {
                    "text": "Do the results, detection limits and reporting bases demonstrate compliance with the applicable acceptance criteria?",
                    "kind": "measurement",
                    "id": "batch-specific-acceptance-q02"
                  },
                  {
                    "text": "Which jurisdiction, material identity and use category support the supplied hazard and regulatory documentation?",
                    "kind": "boundary",
                    "id": "batch-specific-acceptance-q03"
                  }
                ]
              }
            ]
          },
          {
            "id": "storage-and-requalification",
            "name": "Storage and requalification",
            "description": "Maintain the connection between the characterized sample and the material available for use.",
            "findings": [
              {
                "id": "condition-dependent-release",
                "name": "Condition-dependent release",
                "description": "Define when storage changes or mixing require renewed characterization.",
                "questions": [
                  {
                    "text": "What storage conditions and stability observations support the assigned shelf life for this solid or solution?",
                    "kind": "provenance",
                    "id": "condition-dependent-release-q01"
                  },
                  {
                    "text": "Have precipitation, pH drift, concentration change or evidence of microbial growth altered the batch since testing?",
                    "kind": "measurement",
                    "id": "condition-dependent-release-q02"
                  },
                  {
                    "text": "Which observed changes require retesting, quarantine or rejection before the intended use?",
                    "kind": "action",
                    "id": "condition-dependent-release-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "evidence-and-external-alignment",
        "name": "Evidence and external alignment",
        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
        "layers": [
          {
            "id": "reported-evidence",
            "name": "Reported evidence",
            "description": "Findings from the breadth pass, kept separate from the structural claims.",
            "findings": [
              {
                "id": "evidence-confidence-notes",
                "name": "Check these first",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "This description is based on recall; no sources were consulted.",
                  "Isolation methods matter: acid solubility alone does not distinguish fulvic material from every other soluble organic constituent.",
                  "Verify identifiers, product composition and applicable regulatory categories for the specific preparation; no universal molecular formula, molecular weight or melting and boiling points are supplied."
                ],
                "questions": [
                  {
                    "id": "evidence-confidence-notes-q01",
                    "text": "Which of these check these first hold for the sense of fulvic acid this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-kinds",
                "name": "Kinds and varieties",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Soil-derived fulvic acid",
                  "Aquatic fulvic acid",
                  "Peat-derived fulvic acid"
                ],
                "questions": [
                  {
                    "id": "evidence-kinds-q01",
                    "text": "Which of these kinds and varieties hold for the sense of fulvic acid this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-real-world-use",
                "name": "Real-world use",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Reference material for studying natural organic matter in soils and waters.",
                  "Research on metal binding, contaminant transport and nutrient availability.",
                  "Ingredient in some agricultural soil amendments and fertilizer formulations.",
                  "Research on drinking-water treatment and disinfection by-product formation."
                ],
                "questions": [
                  {
                    "id": "evidence-real-world-use-q01",
                    "text": "Which of these real-world use hold for the sense of fulvic acid this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-failure-modes-and-hazards",
                "name": "Failure modes and hazards",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Composition varies with source and extraction method, so equal mass concentrations need not produce equivalent effects.",
                  "Metal binding can change contaminant mobility and bioavailability; the direction depends on the metal and environmental conditions.",
                  "Fulvic organic matter can contribute precursors for disinfection by-products during water treatment.",
                  "Commercial preparations can contain residual salts, metals or other source-derived impurities.",
                  "Treating fulvic acid as a pure compound can lead to misleading molecular formulas, molecular weights and physical-property values."
                ],
                "questions": [
                  {
                    "id": "evidence-failure-modes-and-hazards-q01",
                    "text": "Which of these failure modes and hazards hold for the sense of fulvic acid this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-neighbours",
                "name": "Neighbouring kinds and how to tell them apart",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  {
                    "name": "Humic acid",
                    "difference": "Humic acid precipitates when an alkaline extract is acidified to about pH 1; fulvic acid remains in solution."
                  },
                  {
                    "name": "Humin",
                    "difference": "Humin is the fraction insoluble in both aqueous acid and alkali under the extraction conditions used."
                  },
                  {
                    "name": "Humic substances",
                    "difference": "Humic substances is the broader operational category that includes fulvic acid, humic acid and humin."
                  },
                  {
                    "name": "Dissolved organic matter",
                    "difference": "Dissolved organic matter includes many dissolved organic constituents beyond the operationally isolated fulvic fraction."
                  },
                  {
                    "name": "Fulvate",
                    "difference": "Fulvate denotes deprotonated or salt forms of fulvic acidic constituents rather than a separate uniform molecular substance."
                  }
                ],
                "questions": [
                  {
                    "id": "evidence-neighbours-q01",
                    "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of fulvic acid this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Which operational definition and analytical standard should anchor this registry entry across environmental isolates and commercial materials?",
    "Which CAS, EC or other identifiers accurately cover the intended fulvic-acid material, and where do their boundaries differ from supplier usage?",
    "How comparable are fulvic-acid content measurements across extraction and assay methods, particularly for salt-rich commercial preparations?",
    "Which reference materials and complementary measurements adequately distinguish the fulvic fraction from other acid-soluble organic matter?",
    "Which batch-specific contaminant limits, stability criteria and performance evidence are required for each intended use and jurisdiction?"
  ],
  "statistics": {
    "bundles": 6,
    "layers": 11,
    "findings": 15,
    "questions": 32
  }
}
