Napier, James, 1810-1884, Fesquet, A. A · Philadelphia : H. Carey Baird · leaf 248
ging them into leather, and is termed tannin, or, from its having some acid properties, tannic acid. The best galls, according to Sir H. Davy, contain 26 per cent, tannin and 6.2 of gallic acid, but from the circumstance of these two compounds being generally found together in the same vegetable… … having a light amber color, and the consistence of a syrup, occupying the lower part. These liquids are poured into a dropping tube, upon which the finger is kept, and after remaining at rest for a few minutes, they again separate; the heavy liquid is then allowed to fall out into a capsule, and…
Dyes and dyeing · Coal-tar colors
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