An acid much used, and very valuable for this purpose, is tannic acid.
Those gall nuts which are not pierced contain most tannic acid.
tannic acid, not as free acid, is combined with caffein as a tannate.
It is a durable wood, made so by the tannic acid it contains.
The Ceylon tea possesses little or no tannic acid, and is not nearly so deleterious to weak stomachs as other varieties.
The bark is free from any bitter principle, as well as from tannic acid.
It seems to be suited for pills containing chemical substances, such as quinine, tannic acid, &c.
It is often of importance to the tanner and dyer to determine the richness of this article in tannic acid or tannin.
Hog skin is so full of oil that it resists the tannic acid, yet saddles are made from it, and it has other uses.
To a saturated solution of tannic acid in alcohol and ether, in equal parts, add as much pyroxylin as the liquid will dissolve.
vegetable substance capable of converting animal hide to leather, 1802, from French tannin (1798), from tan "crushed oak bark containing tannin" (see tan (v.)). Tannic acid first recorded 1836, from French acide tannique, inroduced 1834 by Pelouze.
tannic acid n.
A white or yellowish astringent powder used as a denaturant and in tanning and textiles.
A lustrous yellowish to light brown amorphous, powdered, flaked, or spongy mass derived from the bark and fruit of many plants and used as a mordant and to clarify wine and beer.
|tannic acid |
A lustrous, yellow-brown, amorphous tannin, having the chemical composition C76H52O46. It is derived from the bark and fruit of many plants and used in photography, as a mordant, and as a clarifying agent for wine and beer.
Any of various compounds, including tannic acid, that occur naturally in the bark and fruit of various plants, especially the nutgalls, certain oaks, and sumac. Tannins are polyphenols, and form yellowish to light brown amorphous masses that can be powdery, flaky, or spongy. They are used in photography, dyeing, in tanning leather, in clarifying wine and beer, and as an astringent in medicine. Tannins are also an important ingredient in tea.