A chemical compound containing both azo (nitrogen) and sulphine (sulfur-based) functional groups.
From 'azo-' (nitrogen compound) + 'sulphine' (from Latin 'sulphur' with the chemical suffix '-ine' indicating a compound class), created during 19th-century synthetic organic chemistry advances.
Combining nitrogen and sulfur in one molecule was a game-changer for dye chemistry because sulfur compounds interact with fabrics differently than nitrogen alone—giving dyers new colors and better permanence on different materials.
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