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A crystal of the astringent alum
A crystal of the astringent alum
The astringents and acids in fresh blackthorn berries (sloes) give the fruit its sourness.
The astringents and acids in fresh blackthorn berries (sloes) give the fruit its sourness.
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Tannin powder (mixture of compounds)
Tannin powder (mixture of compounds)
A bottle of tannic acid solution in water
A bottle of tannic acid solution in water
Tannin-rich fresh water draining into Cox Bight from Freney Lagoon, Southwest Conservation Area, Tasmania, Australia
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
Bog-wood (similar to, but not, driftwood) in an aquarium, turning the water a tea-like brown