The most useful dye for those fabric which can form hydrogen bonds is:_____________?
Correct answer: D. Direct dye
- A. Mordent dye
- B. Vat dye
- C. Acid dye
- D. Direct dye
Explanation
Direct dyes are useful for fibres such as cellulose because their molecules can form hydrogen bonds with hydroxyl groups in the fibre. The likely distractor is acid dye, which is mainly applied to protein fibres such as wool and silk under acidic conditions.
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About Dyes
Dyes are coloured organic compounds that form a stable bond or strong attraction with fibres, while pigments are generally insoluble and need a binding medium. The topic covers chromophores, auxochromes and conjugated systems, as well as acid, basic, direct, reactive, azo and mordant dyes.
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