A type of tannin compound found in plants that is easily oxidized and breaks down readily in water, used in leather tanning and dyeing.
From Greek 'eu-' (well) + 'tannin' (from French 'tan', oak bark). Describes a readily-usable form of tannin in industrial processes.
Eutannins were crucial to human history—these plant chemicals transformed animal hides into leather, making possible everything from armor to shoes that civilization depended on.
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