Glossary: tannin
Any of various yellowish or brownish solid compounds found in many plants and used for various commercial purposes. Derived from gallic acid and also known as tannic acid. Often present in water bodies with large amounts of decaying vegetation or where the underlying or surrounding soil contains peat and responsible for the typically brownish (tea-coloured) water in such environments and aquaria containing certain types of wood.
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14th Jan 2025
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14th Jan 2025
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