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Classification of Dye based on chemical nature
Classification of dye based on chemical nature can be described as follows
Indigoid dyes
this is often the foremost necessary cluster of natural dyes. The colouring material is extracted from Indigoferatinctoria, a herb family. The dye was used pre‐historically in Republic of India, wherever it in all probability originated. The word springs from “Indican”.
Indigoid Dye Structure
Anthraquinonedyes
a number of the foremost necessary red dyes ar supported the anthraquinonestructure. they’re obtained each from plants and insects. These dyes ar characterised by smart fastness to light-weight. They kind complexes with metal salts and therefore the resultant metal‐complex dyes have smart wash fastness
Anthraquinone Structure
Alpha‐napthoquinones
the foremost outstanding member of this category of dyes is lawsone. it’s obtained from Lawsoniainermis
Alpha‐napthoquinones
Flavones
Flavoneis colorless chemical compound. Most of the natural yellow colours ar hydroxyand methoxy derivatives of flavones and isoflavones. it’s obtained from as dirt on flowers and seeds of assorted Primulaspecies, in buds of assorted kinds of poplar, in yellow dahlias, in weld (Reseda luteola) and dyer’s broom (Genistatinctoria).
Flavones dyes