Excerpt from Lectures on Pharmacology for Practitioners and Students, Vol. 2
We now pass on to the consideration of another group of remedies, namely, those containing tannic acid. Acidum tannicum, tannin, occurs as a white or yellowish amorphous powder, or as thin, glistening, almost colourless scales. It is soluble in an equal weight of water, and in two parts of alcohol, but insoluble in pure ether. The solutions have an acid reaction, an astringent taste, and form a bluish-black precipitate with the persalts of iron.
Tannic acid is obtained from oak galls, gall?, especially from those found on Quercus lusitanica, var. infectoria, a shrub or small tree growing in Asia Minor. Galls are round excrescences on the young shoots, caused by the puncture of the gall-insect, Cynips gall?-tinctori?.
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