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2. Rust converter - Wikipedia

   en.wikipedia.org/wiki/Rust_converter

   Tannic acid chemically converts the reddish iron oxides into bluish-black ferric tannate, a more stable material. [2] The second active ingredient is an organic solvent such as 2-butoxyethanol (ethylene glycol monobutyl ether, trade name butyl cellosolve) that acts as a wetting agent and provides a protective primer layer in conjunction with an ...

3. Tannic acid - Wikipedia

   en.wikipedia.org/wiki/Tannic_acid

   The chemical formula for commercial tannic acid is often given as C 76 H 52 O 46, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid.

4. Iron gall ink - Wikipedia

   en.wikipedia.org/wiki/Iron_gall_ink

   In a litre of ink there must be at least 27 g of tannic acid and gallic acid, and at least 4 g of iron content. The maximum iron content is 6 g/L. After 14 days' storage in a glass container the ink must not have stained the glass or show sedimentation. Eight-day-old writings, after washing with water and alcohol, must remain very dark.

5. Tannin - Wikipedia

   en.wikipedia.org/wiki/Tannin

   Representative chemical structure of a tannic acid, a type of tannin Tannin powder (mixture of compounds) A bottle of tannic acid solution in water. 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.

6. Acid neutralizing capacity - Wikipedia

   en.wikipedia.org/wiki/Acid_neutralizing_capacity

   Acid-neutralizing capacity or ANC in short is a measure for the overall buffering capacity against acidification of a solution, e.g. surface water or soil water.. ANC is defined as the difference between cations of strong bases and anions of strong acids (see below), or dynamically as the amount of acid needed to change the pH value from the sample's value to a chosen different value. [1]

7. Blackwater river - Wikipedia

   en.wikipedia.org/wiki/Blackwater_river

   A swamp-fed stream in northern Florida, showing tannin-stained undisturbed blackwater. A blackwater river is a type of river with a slow-moving channel flowing through forested swamps or wetlands.