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Gallic acid   /gˈælɪk ˈæsəd/   Listen
adjective
Gallic  adj.  Pertaining to, or derived from, galls, nutgalls, and the like.
Gallic acid (Chem.), an organic acid, very widely distributed in the vegetable kingdom, being found in the free state in galls, tea, etc., and produced artificially. It is a white, crystalline substance, C6H2(HO)3.CO2H, with an astringent taste, and is a strong reducing agent, as employed in photography. It is usually prepared from tannin, and both give a dark color with iron salts, forming tannate and gallate of iron, which are the essential ingredients of common black ink.





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"Gallic acid" Quotes from Famous Books



... then a solution of nitrate of silver. Iodide of silver forms, and saturates the paper. The excess of nitrate of silver and the heavy yellow powder which forms are now washed off, and the paper is ready for the camera. The picture may be developed by a solution of gallic acid mixed with a very small quantity of an aqueous solution of acetic acid and nitrate of silver. The picture is fixed by washing with hyposulphite of soda. If you wish to derive any pleasure from photography, you ...
— Harper's Young People, December 2, 1879 - An Illustrated Weekly • Various
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... will be utilised in certain industrial operations, on account of their power in destroying organic matter. The conversion of alcohol into vinegar in the process of acetification and the production of gallic acid by the action of fungi on wet gall nuts, are already connected with this kind of phenomena. [Footnote: We shall show, some day, that the processes of oxidation due to growth of fungi cause, in certain decompositions, ...
— The Harvard Classics Volume 38 - Scientific Papers (Physiology, Medicine, Surgery, Geology) • Various
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... mixture of gallic acid and oil of vitriol is carefully and gradually heated to 140, a viscid wine-red liquid results. If this be poured into cold water, after cooling, a heavy brown-red granular precipitate is formed, soluble in 3333 parts of boiling water. It dissolves in potash-ley, ...
— Field's Chromatography - or Treatise on Colours and Pigments as Used by Artists • George Field
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... the animal kingdom, and some even from vegetable substances. Azote, for instance, joined to hydrogen and charcoal, form the base or radical of the Prussic acid; we have reason to believe that the same happens with the base of the Gallic acid; and almost all the animal acids have their bases composed of azote, phosphorus, hydrogen, and charcoal. Were we to endeavour to express at once all these four component parts of the bases, our nomenclature would undoubtedly be ...
— Elements of Chemistry, - In a New Systematic Order, Containing all the Modern Discoveries • Antoine Lavoisier
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... vitriol, it must have referred to "gall" ink. Further investigation discloses the fact that such galls were of Chinese origin and as we know they do not contain the necessary ferment which the aleppo and other galls possess for inducing a transformation of the tannin into gallic acid, no complete union could therefore obtain. Hence the value of this composition was limited until the time when yeast and other materials were introduced to overcome ...
— Forty Centuries of Ink • David N. Carvalho
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