Basic dye

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A cationic dye characterized by its substantivity for basic-dyeable acrylic and basic-dyeable polyester fibres, especially the former. The term was originally applied to tannin-mordant cotton dyes
see also acid dye

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A class of dyes, usually synthetic, that act as bases, and which are actually aniline dyes. Their color base is not water soluble but can be made so by converting the base into a salt. The basic dyes, while possessing great tinctorial strength and brightness, are not generally light-fast

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