Abstract
Acid dyes are applied from acidic bath, are anionic and soluble in water; applied on wool, silk and nylon when ionic bond is established between protonised amine group of fibre and acid group of dye. Overall wash fastness is poor, though light fastness is quite good. Due to opposite electrical nature of dye and fibre, strike rate and uptake of acid dye on these fibres is faster; electrolyte at higher concentration is added to retard dye uptake and to form levelled shades. Acid generates cation on fibre and temperature helps to substitute negative part of acid with anionic dye molecules.
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