Describing azo compounds with two sulphonic acid groups, used in textile dyes and as water-soluble colorants.
From 'azo-' combined with 'di-' (two) and 'sulphonic' (containing -SO₃H groups). These compounds were developed to make azo dyes water-soluble for easier textile application.
Azodisulphonic acid dyes transformed textile manufacturing—the sulphonic acid groups make them dissolve in water instantly, allowing factories to apply dyes in huge vats instead of relying on complex organic solvents.
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