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OpenStudy (anonymous):

How do dyes attach to fibres? In particular how does an azo dye attach to cotton and wool and how does turmeric attach to cotton and wool.

OpenStudy (chmvijay):

see wool or cotton contains the basic -NH2 groups and that of your dyes contains acidic groups like -COOH, -SO3H hence they form NH3+and COO- bond and get atracted etween themselves |dw:1371188797547:dw|

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