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Direct dye, also called Substantive Dye, any of a class of coloured, water-soluble compounds that have an affinity for fibre and are taken up directly, such as the benzidine derivatives.
Based on the illustration of industrial classifications, lawsone is Natural Orange 6 and CI 75480 which is chemically known as 2-hydroxy-1,4-naphthoquinone (Scheme 1) and acts as a substantive dye for protein fiber as well as other textile fibers and imparts orange color on the substrate (Bhuiyan et al. 2017a).
Trees with high tannin content are often classified as a substantive dye which do not require a metallic mordant, but may also be used as a mordant depending on their tannin amount and chemical structure (Dean 2014; Ismal et al. 2014; Prabhu and Bhute 2012).
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Direct, or substantive, dyes are applied to the fabric from a hot aqueous solution of the dye.
Textile dyes include acid dyes, used mainly for dyeing wool, silk, and nylon; and direct or substantive dyes, which have a strong affinity for cellulose fibres.
Substantive dyes: Those dyes which become chemically fixed to the fiber without the aid of any other chemicals or additives are referred to as substantive dyes or direct dyes.
Irrespective of the source of origin, natural dyes can be categorized as: 1. Substantive dyes: Those dyes which become chemically fixed to the fiber without the aid of any other chemicals or additives are referred to as substantive dyes or direct dyes.
Some dyestuffs, such as indigo and lichens, will give good color when used alone; these dyes are called direct dyes or substantive dyes.
Reactive dyes are the most substantive of dyes used on cotton because of their covalent bonding with glucoside hydroxyls.
In a modification called the substantive process, the appropriate dye couplers are suitably embedded in the emulsion in the appropriate colour layers to prevent their moving about during processing and contaminating the colours (an important problem).
Commercial theatrical motion pictures are photographed on a colour negative stock containing dye couplers (i.e., substantive type) from which prints can be made.
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