Question

Why acid dyes is called acid dyes ?​

Answer 1

Answer:

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Acid generates cation on fibre and temperature helps to substitute negative part of acid with anionic dye molecules. An acid dye is a dye that is typically applied to a textile at low pH. They are mainly used to dye wool, not cotton fabrics.

Answer 2

Acid dyes are typically used to dye natural protein (wool and silk), synthetic polyamide (nylon) and to a small extent acrylics and blends of these fibres. They are so called because they are applied to these fibres from dyebath in acidic or neutral conditions. ... Chrome dyes are also considered as acid dyes.