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
Tanning (leather)
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Tanning, or hide tanning, is the process of treating skins and hides of animals to produce leather. A tannery is the place where the skins are processed.
Tannin
…English tanning, Medieval Latin tannare, from Proto-Celtic *tannos "oak") refers to the abundance of these compounds in oak bark, which was used in tanning animal hides into leather. The tannin compounds are widely distributed in many species of plants, where they play a role in protection from predation…
Tanned leather
Tanning, 1880
Tanner, Nuremberg, 1609
Peeling hemlock bark for the tannery in Prattsville, New York, during the 1840s, when it was the largest in the world