A blue or green dye produced by combining gallnut extract with cyanide or similar compounds, used in histology and textile dyeing.
From 'gallo-' (from gallnut) plus 'cyanin' (from Greek 'kyanos' meaning 'blue'). This synthetic dye emerged in 19th-century chemistry labs as researchers learned to combine plant tannins with synthetic compounds.
Gallocyanin is the bridge between medieval plant-based dyes and modern synthetic chemistry—it's literally what happened when ancient knowledge met industrial chemistry in the 1800s.
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