Tannin
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Tannins are a class of astringent, polyphenolic biomolecules that bind to and precipitate proteins and various other organic compounds including amino acids and alkaloids. The term tannin is widely ap
Tannin powder (mixture of compounds)
Tannin-rich fresh water draining into Cox Bight from Freney Lagoon, Southwest Conservation Area, Tasmania, Australia
Bog-wood (similar to, but not, driftwood) in an aquarium, turning the water a tea-like brown
A mute swan with reddish-brown staining on the top of its head, caused by exposure to dissolved tannins and iron compounds in water
Astringent
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An astringent is a chemical that shrinks or constricts body tissues. The word derives from the Latin adstringere, which means "to bind fast". Astringency, the dry, puckering or numbing mouthfeel cause
Tannin
…Tannins (or tannoids) are a class of astringent, polyphenolic biomolecules that bind to and precipitate proteins and various other organic compounds including amino acids and alkaloids. The term…
A crystal of the astringent alum
The astringents and acids in fresh blackthorn berries (sloes) give the fruit its sourness.