dye
Let an agent explain dyes and their classification, distinguish dyes from pigments, relay chemistry, application and regulation, and identify natural and synthetic dye families.
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.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain dyes and their classification, distinguish dyes from pigments, relay chemistry, application and regulation, and identify natural and synthetic dye families.
A coloured substance that binds chemically or physically to a material such as textile, paper, leather, hair or food to give it colour, dissolving in the medium unlike pigments, which remain as particles; dyes include natural dyes such as alizarin from madder, indigo and turnsole, and synthetic classes such as azo, triarylmethane and anthraquinone dyes including Patent Blue and Light Green SF, and are classified by chemical structure and by application method.
What it is for: Colouring materials.
It can be explain classification and chemistry; distinguish dyes from pigments; relay application methods; relay regulation and safety.
Distinguishing features
Solubility and binding
Chromophores and auxochromes
Classification by structure and application
Regulated for food and cosmetics
What it looks like
Coloured powders or solutions that impart colour to substrates.
How it is recognised
Soluble colourant binding to a substrate
Natural and synthetic families
Pigments are insoluble particles; stains in biology are dyes used for microscopy
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is contrasted with - insoluble colourants
is applied by - the process
In practice
Families and kinds
natural dyes such as madder alizarin, indigo, cochineal and turnsole
azo dyes
triarylmethane dyes such as Patent Blue and Light Green SF
anthraquinone, indigoid and other structural classes
application classes: acid, basic, direct, disperse, reactive, vat and mordant dyes
food and cosmetic dyes
Identifiers
Colour Index C.I. names and numbers international dye classification
Standards and regulation
Colour Index classification
Food additive regulations for food dyes
Cosmetics regulations
REACH and restrictions on certain azo dyes
Textile labelling and effluent rules
Failure modes and hazards
Toxicity and allergenicity of some dyes
Environmental pollution from dye effluent
Fading and poor fastness
Confusing dyes with pigments
Also called
+28
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.dye
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a dye is.
Science.
Definition
Definition and distinctions.
Definition
Definition.
- What is a dye, and how does it differ from a pigment and a stain? definition
- Is the colourant a dye or a pigment? boundary
Chemistry
Chemistry of colour.
Chemistry
Chemistry.
- How do chromophores and molecular structure produce colour, and how are dyes classified? definition
- Which entry fits the specific dye class? action
Apply Application.
Practice.
Dyeing
Dyeing methods.
Dyeing
Dyeing.
- How are different dye classes applied to fibres, and what is fastness? provenance
- Which entry fits dyeing? action
Other
Other uses.
Other
Other.
- How are dyes used in food, cosmetics, inks and biological staining? provenance
- Which references are standard? provenance
Regulate Safety and regulation.
Regulation.
Safety
Safety.
Safety
Safety.
- What health and environmental concerns apply to dyes, and which are restricted? provenance
- Is the user asking about a personal reaction, which needs a clinician? boundary
Rules
Regulation.
Rules
Rules.
- How are food, cosmetic and textile dyes regulated? provenance
- Which sources are cited? provenance
Context History and industry.
Context.
History
History.
History
History.
- How did dyes develop from natural sources to the synthetic dye industry after mauveine? provenance
- Which entry fits the history of the chemical industry? action
Industry
Industry.
Industry
Industry.
- How is the dye industry organised, and what are current trends? provenance
- Which entry fits the textile industry? action
What the second pass must settle
- Should natural dye and azo dye be separate primary entries?
- How should the Colour Index be linked?
- The registry entry has merged aliases naming specific dyes; should they be split off?