Note:  Do not rely on this information. It is very old.

Galloflavin

Galloflavin, a yellow dyestuff obtained by the oxidation of gallic acid. This is usually accomplished by blowing air through a solution of the acid in dilute potash until a precipitate occurs.

which is afterwards treated with a dilute acid. By recrystallisation it is obtained in yellow crystals, which dye cotton yellow, the shade varying with the mordant employed.