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Acid Dyes
  They are anionic substances which generally show good solubility and good brightness. Almost all of them have a regular to good light fastness and regular bleeding fastness. They are composed of organic substances which absorb particular light wavelengths. Acid Dyes consist of azo, anthraquinone, thriphenylmehtane, azine, xanthenes, ketonimide, nitro and nitroso compounds. Their main application is found on wool, silk, polyamide, acrylic and regenerated protein fibres.

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