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Acidum Gallicum. Gallic Acid |
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Acidum Gallicum. Gallic Acid |
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This section is from the "A Practical Treatise On Materia Medica And Therapeutics" book, by Roberts Bartholow. Also available from Amazon: A Practical Treatise On Materia Medica And Therapeutics
Acide gallique, Fr.; Gallậpfel-saure, Ger.
Gallic acid is in small, silky, nearly colorless crystals, having a slightly acid and astringent taste. It is soluble in one hundred parts of cold and in three of boiling water. The solution reddens litmus, and does not produce a precipitate with a solution of gelatin, or of sulphate of protoxide of iron. With solutions of salts of sesquioxide of iron it produces a bluish-black precipitate, the color of which disappears when the liquid is heated. It is decomposed by a strong heat, and entirely dissipated when thrown on red-hot iron. Dose, gr. j—gr. x.
Ointment of gallic acid. (Gallic acid, 10 grm.; benzoinated lard, 90 grm.)
The following remedies contain a tannic acid, and have physiological and therapeutical actions due to the presence of this substance:
Xutgall. Noix de galle, Fr.; Galläpfel, Ger.
Tincture of galls. Dose, 3 ss— 3 ij.
Ointment of galls. (Galls in fine powder, 20 grm.; benzoinated lard, 80 grm.)
Tannic acid (gallo-tannic), 60 to 70 per cent; gallic acid, 3 per cent; sugar, resin, etc.
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