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Tannic   Listen
adjective
Tannic  adj.  Of or pertaining to tan; derived from, or resembling, tan; as, tannic acid.
Tannic acid. (Chem.)
(a)
An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid.
(b)
By extension, any one of a series of astringent substances resembling tannin proper, widely diffused through the vegetable kingdom, as in oak bark, willow, catechu, tea, coffee, etc.






Collaborative International Dictionary of English 0.48








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"Tannic" Quotes from Famous Books



... not be infused longer than three or four minutes, and cream should be used with it. The albuminous matter in milk tends to throw down some of the tannic acid in an insoluble form. It should not be taken too hot, and if taken at a meat meal (which is undesirable), not till quite the conclusion of the meal. Much tea-drinking produces nervousness and indigestion. If taken very weak it forms a pleasing addition to the morning and evening meal, ...
— Papers on Health • John Kirk

... saturated aqueous solution 2 c.c. Tannic acid, 20 per cent. aqueous solution 2 c.c. Potash alum saturated ...
— The Elements of Bacteriological Technique • John William Henry Eyre

... poisonous in their nature, and introduce a possible element of danger to the wearer of the dyed article. For many years, almost the only method of dyeing cotton goods with the aniline colors consisted in a preliminary steeping in sumac or tannic acid, followed by a passage in some suitable compound of tin, and subsequent dyeing in the coloring matter. Sumac and tin have been used for two hundred years or more as the dyer's basis for a considerable number of shades of color from old dye-stuffs; there never has been the ...
— Scientific American Supplement, Vol. XIX, No. 470, Jan. 3, 1885 • Various

... without dissolving the sericin or silk-gum. By heating under pressure with acetic acid, however, silk is completely dissolved. Silk is also dissolved by strong sulphuric acid, forming a brown thick liquid. If we add water to this thick liquid, a clear solution is obtained, and then on adding tannic acid the fibroin is precipitated. Strong caustic potash or soda dissolves silk; more easily if warm. Dilute caustic alkalis, if sufficiently dilute, will dissolve off the sericin and leave the inner fibre of fibroin; but they are not so good for ungumming silk ...
— The Chemistry of Hat Manufacturing - Lectures Delivered Before the Hat Manufacturers' Association • Watson Smith

... synthetic tannins employs two quite distinct methods; one is to synthesise the most simple tannin, viz., the tannic acid contained in galls (tannin), or to build up substances similar in character to the tannins, from hydroxybenzoic acids. The other, entirely new way, is to produce chemical substances, which certainly have nothing ...
— Synthetic Tannins • Georg Grasser

... is very much larger than in Black teas. An analysis by Mulder gave as the percentage of tannin in a Black tea, 12.85 per cent., and in a green tea as 17.80 per cent. But another analysis made by Y. Kazai, of the Imperial College of Agriculture of Japan, made the per centage of tannin (gallo- tannic acid) in a Green tea 10.64, and in a Black tea from the same leaf 4.89. In the green leaf from which these teas were derived he found 12.91 per cent. of tannin. This analysis indicates also that a portion ...
— Tea Leaves • Francis Leggett & Co.

... phosphoric acid at all the degrees of hydration, and even by a current of carbonic acid. All these precipitates redissolve with an excess of acid, sulphuric acid excepted. Concentrated sulphuric acid forms an insoluble downy white precipitate, and the concentrated vegetable acids, with the exception of tannic acid, do not determine any precipitate. Cerealine coagulated by an acid redissolves in an excess of the same acid, but it has become dead and has no more action on the starch. The alkalies do not form any precipitate, ...
— Scientific American Supplement No. 275 • Various

... with one hundred rounds of ammunition and a shotgun with fifty rounds; matches, a hatchet, knives, a can opener, salt, needles and thread; and the following medical supplies: catgut and needles, bandages and cotton, quinine, astringent (tannic acid), gauze, plaster-surgical liniment, boracic ...
— The North Pole - Its Discovery in 1909 under the auspices of the Peary Arctic Club • Robert E. Peary



Words linked to "Tannic" :   tannin, tannic acid



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