Tannins are bitter-tasting chemical compounds that bind proteins. Tannins are present in the following:
Tannins are also used in the treatment of leather, to make it more durable.
Tannic acid, a type of tannin
Tannin powder (mixture of compounds).
Tannin in a plastic container
A bottle of tannic acid solution in water.
Strawberries in a bowl
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
Upper Tahquamenon falls Panoramic view