Relating to or containing two sulfonic acid groups or two sulfur-acid units.
From dis- (two) + sulphonic, where sulphonic comes from sulfur + -onic (resembling an acid), describing compounds with two acidic sulfur-containing groups.
Disulphonic acids were crucial in developing azo dyes that colored everything from fabrics to food—chemists learned to attach these two-acid molecules to create brilliant, stable colors that didn't fade.
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