watercolor
Enable an AI agent to recognise a watercolor painting activity, assess its working state and judge which interventions remain possible for the intended result.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a watercolor painting activity, assess its working state and judge which interventions remain possible for the intended result.
Watercolor is a water-borne painting system in which finely divided pigments are dispersed in a hydrophilic binder (classically gum arabic, often with a humectant such as honey or glycerin) so that the paint can be diluted, applied in typically transparent washes, and reactivated with water after drying, almost always on an absorbent support such as paper.
It can be Plan a wash and its wetting sequence for a specified area and edge behaviour.; Identify regions that can receive another application and regions that need further observation or drying.; Preserve paper white through a recorded reserve strategy.; Run small handling tests for mixtures, support response, glazing or lifting before committing to a passage.; Compare emerging edges, value relationships and pigment effects with the intended result.; Choose among continuation, local correction, acceptance and stopping while recording the expected visual tradeoff..
Distinguishing features
Identify whether watercolor paint is the operative medium; dilution with water alone does not distinguish watercolor from acrylic, gouache or ink.
Check whether support wetness and water loading are being used to control pigment spread and edge formation, rather than merely to clean or dilute materials.
Check whether transparent passages and exposed or reserved support contribute to the intended light areas; opaque accents should be recorded without automatically excluding watercolor.
Distinguish watercolor painting activity from a finished watercolor artwork or a container of watercolor paint by the presence of application decisions, working surface states and an actionable sequence.
For mixed-media work, identify which passages and decisions depend on watercolor behaviour rather than assuming the whole activity follows one medium's constraints.
Scope
+ The intended role of washes, transparency, paper white and visible marks
+ The working relationship among watercolor paint, water, tools and support
+ Local wetness, pigment movement and drying readiness
+ Application sequences including washes, glazing, lifting and reserved areas
+ Assessment of emerging effects and feasible corrective or finishing actions
- Manufacture, formulation and commercial inventory of watercolor paints
- Paper manufacture and general material certification
- Artwork ownership, valuation, exhibition and sale
- Long-term conservation and restoration of completed artworks
- General drawing, composition and colour theory independent of watercolor handling
Characteristics
- Activity interpretation
- painting activity | finished artwork | paint material | unresolved Prevents the ACT entry from silently absorbing neighbouring concepts.
- Intended watercolor effects
- transparent wash | graded wash | soft transition | hard edge | drybrush texture | other stated effect An observed bloom or broken mark can be desirable or problematic depending on intent.
- Working support
- Reference to the support, its prepared surface and any tested handling behaviour The actual surface constrains spreading, lifting, repeated wetting and acceptable interventions.
- Paint identity
- References to paints or mixtures, with known identity and locally observed behaviour Handling decisions should use the paints actually present rather than assume all watercolor behaves alike.
- Local surface wetness
- pooled | visibly wet | damp | apparently dry | uncertain, recorded by region and observation time Different regions may permit different marks or require waiting.
- Brush or applicator load
- Relative water load and pigment load, with observation or preparation method The relationship between applicator load and surface wetness affects the next application.
- Elapsed time since wetting
- Minutes, associated with a region and wetting event Provides timing context without treating elapsed time alone as proof of dryness.
- Reserved light areas
- unpainted | masked | partially covered | lost | intentionally replaced by opaque material Preserving support white and adding a light material are different operations with different outcomes.
- Intervention readiness
- ready for intended action | wait | test first | stop | unresolved Connects observations to a specific next action rather than a generic progress label.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Watercolor intent and boundaries Establishes what watercolor means in this activity and which visual effects guide its handling.
The registry supplies no definition, and watercolor can name an activity, a material or its result.
Operative medium
Locates watercolor within the activity and any mixed-media passages.
Role of watercolor
Record the medium identification and the passages whose handling depends on watercolor.
- What identifies the paint or application as watercolor in this activity? definition
- Which passages use another medium and require separate handling constraints? boundary
Intended light and marks
Connects transparency, reserves and edge character to the intended image.
Target wash character
Record desired wash, edge and light-area effects so that variation can be judged against intent.
- Which areas should retain support white, transparent colour or deliberately opaque accents? definition
- Where are hard edges, soft transitions or broken drybrush marks intended? definition
Paint, support and handling tests Records the material combination actually being used and evidence of its behaviour.
Useful watercolor decisions depend on the specific paint and surface combination, not just the medium label.
Paint and mixture behaviour
Associates working colours with their identities, mixtures and observed responses.
Working colour evidence
Record paint identification and tests relevant to transparency, texture, mixing and removal.
- Which paint labels, pigment identifiers or preparation records identify the working colours? provenance
- What do swatches on the working support show about transparency, granulation, mixture appearance and lifting? measurement
Support response
Records how the prepared surface responds to the intended water and brush handling.
Surface tolerance
Capture observed spreading, pooling, buckling and surface disturbance without assuming a universal tolerance.
- What support and preparation are in use, including any stretching, mounting or surface treatment? provenance
- What evidence indicates whether this surface can tolerate the proposed repeated wetting or lifting? action
Water state and pigment movement Tracks local working conditions during application and drying.
A watercolor passage can change action possibilities as its water redistributes or evaporates.
Regional wetness
Treats wetness as spatially uneven and time dependent.
Wetness map
Record the condition of the intended application region and adjacent areas it may affect.
- Where are pooling, sheen, dampness or apparent dryness observed, and when were they observed? measurement
- What further check is needed before treating the target region as ready for the intended mark? action
Flow and edge development
Relates paint additions, water additions and support orientation to visible movement.
Wash movement
Record advancing pigment, wash beads, merging boundaries and developing blooms against the intended effect.
- How are pigment fronts, beads and edges moving relative to the desired boundary? measurement
- Would adding paint or water, changing tilt, removing a pool or waiting best support the intended transition? action
Wash sequence and light reserves Organises applications around underlying passages and areas that must remain light.
The next application must account for existing colour, drying state and any support white it may cover.
Application dependencies
Records what each wash or glaze depends on and what it is expected to change.
Next wash requirements
Specify the target region, desired effect and readiness conditions for the next application.
- Is the next passage intended to merge into a wet area, lie over a dry passage or leave broken marks on the surface? definition
- What must be checked in the underlying passage before the application proceeds? action
Reserve management
Tracks untouched support and temporary barriers through the painting sequence.
Light-area protection
Record which light areas depend on exposed support and how they will survive neighbouring applications.
- Which light shapes must remain unpainted, and are they protected by brush control, masking or another method? definition
- If masking is used, what product guidance or local test supports its application and removal on this surface? provenance
Assessment, correction and stopping Judges the emerging result and bounds further intervention.
Watercolor effects need to be assessed against intent, and attempted corrections can change both the image and the working surface.
Settled appearance
Separates provisional wet appearance from observations made after the passage has dried.
Result against intent
Assess value relationships, edges, wash evenness and pigment texture at a recorded drying state.
- At what drying state were the passage's value, colour and edge relationships assessed? measurement
- Which blooms, textures or uneven areas support the intended effect, and which require a decision? boundary
Bounded intervention
Connects possible corrections with material evidence and acceptable visual changes.
Correction or stop
Record a proposed intervention, its evidence, expected tradeoffs and stopping condition.
- What test or prior observation supports lifting, softening, glazing or repainting this particular passage? action
- What loss of surface integrity, transparency, edge control or reserved light would make further intervention unacceptable? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- transparent watercolor (aquarelle)
- pan / cake watercolor
- tube watercolor
- liquid watercolor and watercolor ink
- watercolor pencils, crayons and sticks
- student-grade watercolor
- professional / artist-grade watercolor
- granulating versus staining watercolor pigments
- Which of these kinds and varieties hold for the sense of watercolor this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q154874 - Item for watercolor/watercolour painting as a technique; constituent paints are identified separately via pigment items.
- Colour Index Generic Name - P{B|R|Y|G|O|V|Br|Bk|W}{number} (e.g. PB29, PR254, PY42) - Names the pigment, not the brand hue; professional tubes and pans are specified by C.I. name plus binder.
- Harmonized System - 3213 (3213.10 colours in sets; 3213.90 other) - Trade heading for artists', students' and similar colours in tablets, tubes, jars, bottles or pans, including watercolor.
- ASTM specification - ASTM D5067 - Product specification that a paint must meet to be sold as artists' watercolor in the ASTM sense.
- Which of these identifiers and schemes hold for the sense of watercolor this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- ASTM D5067 Standard Specification for Artists' Watercolor Paints (ASTM International)
- ASTM D4303 lightfastness test methods for artists' colorants (ASTM International)
- ASTM D4236 chronic health-hazard labeling of art materials / US LHAMA (ASTM International; enforced in the United States under 16 CFR 1500.14)
- ISO 105-B02 xenon-arc colour fastness / Blue Wool Scale (International Organization for Standardization)
- EN 71-3 toy-safety migration limits for children's watercolor sets (CEN / national adoptions)
- EU REACH restrictions and labelling for certain pigments (notably some cadmium, cobalt and chromate colorants) (ECHA / European Commission)
- California Proposition 65 warnings on some artist watercolors containing listed pigments (State of California)
- Which of these standards and regulation hold for the sense of watercolor this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Fine-art painting on cotton or cellulose paper, including studio watercolours and outdoor sketching.
- Botanical, zoological and architectural illustration, where transparency and rapid field use still matter.
- School and hobby cake sets; the most common first painting medium in primary education.
- Urban sketching and travel journals, typically in half-pan tins with a water brush.
- Historic map, miniature and manuscript painting, often as opaque or mixed aqueous colour rather than pure aquarelle.
- Museum and private collections of works on paper (Turner, Cézanne watercolours, etc.) that must be stored and displayed as water-sensitive objects.
- Commercial illustration and concept work, now often mixed with watercolor pencils, inks and digital finishing.
- Which of these real-world use hold for the sense of watercolor this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- paper mass per area (watercolor support) - 190-640 (workhorse 300) - g/m²
- lightfastness, ASTM D4303 category - I (excellent) to V (fugitive); artist-grade lines aim for I-II - ASTM category
- lightfastness, Blue Wool Scale - 1-8 (8 most stable) - Blue Wool grade
- tube fill volume - 5-37 (common studio sizes 5, 14/15, 37) - ml
- display and storage relative humidity for finished works - 40-55 - % RH
- archival watercolor paper pH - about 7-9 (neutral to slightly alkaline, often buffered) - pH
- pigment particle size in the dried film - roughly 0.05-10, pigment-dependent; coarse mineral pigments granulate - µm
- Which of these typical measurements hold for the sense of watercolor this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Fugitive pigments fade under light (classic problems: some lakes, opera/rhodamine pinks, early aureolin, certain reds); the loss is irreversible.
- Finished works remain water-soluble: a spill, a damp mat, or high humidity can dissolve, tide-line or offset the paint.
- Paper cockles, buckles or tears if wetted without stretching or if repeatedly soaked.
- Acidic or poor-quality paper yellows, becomes brittle, and foxes; optical brighteners can also discolor.
- Mold growth on honey- or glycerin-rich pans and on damp works on paper.
- Overworking lifts underlayers; staining pigments will not lift and can deaden a passage.
- Blooms, backruns and unintended granulation from uneven drying.
- If applied as a heavy paste, gum-rich films can crack or flake; watercolor is not designed as an impasto medium.
- Toxic or restricted pigments (cadmiums, cobalts, some chromates) are a hazard if ingested, sprayed, or used as children's paint; dust from dried pans is the practical exposure path.
- Poor matting, lignin boards or pressure-sensitive tapes stain and physically damage the sheet.
- Which of these failure modes and hazards hold for the sense of watercolor this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Spelling and institutional names: American watercolor versus British/Commonwealth watercolour; national watercolour societies remain a UK/Commonwealth pattern.
- French and much of continental practice keep aquarelle (transparent) strictly separate from gouache; English-language retail often files both under watercolor.
- East Asian ink-and-wash (Japanese suibokuga/sumi-e, Chinese shuimo) uses soot ink and often animal-glue sizing on washi or xuan paper; it is grouped with watercolor in some catalogues and kept apart in others.
- Indian miniature and Company-school painting is aqueous and paper-based but typically opaque, closer to bodycolour than to Western aquarelle.
- Student cake sets and school tempera/poster colour are sold as watercolor in some education markets and as a separate poster-paint class in others.
- Paper trade sizes and weight naming differ: US watercolor paper is still sold in pounds (90/140/300 lb) alongside gsm; European sheets follow ISO-related sizes more often.
- Which of these regional variation hold for the sense of watercolor this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- gouache (opaque watercolor, bodycolour) - Gouache is formulated to be opaque, usually with an inert white filler (blanc fixe, chalk) and a higher pigment-to-binder ratio; ASTM specifies it separately (D5724) from transparent artists' watercolor (D5067). A dried gouache passage conceals the ground; a watercolor wash does not.
- acrylic ink / acrylic wash - Acrylic binders form a water-insoluble polymer film when dry; gum-arabic watercolor remains resoluble. A dry film that will not redissolve with a wet brush is acrylic (or a waterproof ink), not watercolor.
- egg tempera - Tempera is bound with egg yolk (sometimes whole egg), dries to a lean, largely insoluble film and is built in hatched strokes, not in gum-arabic washes on paper.
- carbon or India ink wash - Many drawing inks are carbon black in shellac or another water-resistant binder; once dry they do not lift as watercolor does. Sumi and some Chinese inks are the exception that still sit on the watercolor border.
- school poster paint / tempera cakes - Poster colour is an opaque, often chalk-loaded emulsion sold for covering large areas on cheap paper; it lacks the transparency, pigment identity and lightfastness claims of artist watercolor.
- oil paint - Oil is bound in drying oil, is not water-miscible in use (except purpose-made water-mixable oils), and forms a hydrophobic film; solvent and drying behaviour separate it immediately from watercolor.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of watercolor this model covers, and on what evidence? provenance
Sources
- Standard Specification for Artists' Watercolor Paints (ASTM D5067) - Defines artist watercolor as a gum-bound aqueous paint, sets working properties, and distinguishes it from related artists' paints such as gouache.
- The Artist's Handbook of Materials and Techniques - Classic materials account of gum arabic binder, paper supports, transparency, lifting, and the distinction from gouache, tempera and ink.
- Handprint: Watercolor Painting (Bruce MacEvoy) - Pigment behaviour in watercolor (transparency, staining, granulation), lightfastness practice, paper weights, and the student/professional grade split.
- Standard Test Methods for Lightfastness of Colorants Used in Artists' Materials (ASTM D4303) - The I-V lightfastness categories used on artist watercolor labels and the fading hazard of fugitive colorants.
- Textiles - Tests for colour fastness - Part B02: Colour fastness to artificial light: Xenon arc fading lamp test (ISO 105-B02) - Blue Wool Scale 1-8 that manufacturers and conservators still map watercolor lightfastness onto.
- Standard Practice for Labeling Art Materials for Chronic Health Hazards (ASTM D4236) - US chronic-hazard labeling (LHAMA) that governs artist and student watercolor packaging.
- Safety of toys - Part 3: Migration of certain elements (EN 71-3) - Migration limits applied to children's watercolor cake sets sold as toys in Europe.
- Colour Index International - C.I. Generic Names (PB29, PR101, PY42, etc.) that identify the actual colorants inside named watercolor paints.
What the second pass must settle
- Does the registry intend watercolor to denote the painting activity exclusively, or also the paint material and completed artwork?
- Where should this entry draw its operational boundary with gouache, watercolor pencils, liquid watercolor products and mixed-media practices?
- Which wetness observations are sufficiently reliable across different supports and viewing conditions to justify specific next actions?
- What evidence is needed before paint properties such as lifting response or rewetting behaviour can be transferred from a test swatch to a working passage?
- Which existing Vercy models already own support condition, artwork assessment or painting procedures and should be linked rather than duplicated?