A yellow dye or pigment derived from gallnut extracts, used historically in textile dyeing and art.
From 'gallo-' (from gallnut) plus 'flavin' (from Latin 'flavus' meaning 'yellow'). This represents another medieval-to-modern dyestuff produced from oak gall tannins combined with other substances.
Before synthetic dyes revolutionized fashion, yellow pigments were rare and expensive—galloflavin represented a way to create consistent yellow from something as humble as an insect gall on a tree.
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