То есть это не ржавчина, а Танин: http://en.wikipedia.org/wiki/Tannin A tannin (a.k.a. vegetable tannin, i.e. a type of biomolecule, as opposed to modern synthetic tannin) is an astringent, bitter plant polyphenolic compound that binds to and precipitates proteins and various other organic compounds including amino acids and alkaloids.
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timeasmymeasure
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Date: 2011-12-27 05:27 pm (UTC)http://en.wikipedia.org/wiki/Tannin
A tannin (a.k.a. vegetable tannin, i.e. a type of biomolecule, as opposed to modern synthetic tannin) is an astringent, bitter plant polyphenolic compound that binds to and precipitates proteins and various other organic compounds including amino acids and alkaloids.