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Same as Tannic acid, under Tannic.

The art or process of converting skins into leather. See Tan, v. t., 1.

A mineral of a steel

rgilioides of Brazil, used as a remedy for consumption; of Byrsonima crassifolia, used in tanning; of Alchornea latifolia, used medicinally; or of Quercus ilex, the cork tree.

seeds and husks of the legumes of a South American tree (Inga Marthæ). It is valuable for tanning leather, and as a dye.

The tanning or dressing of leather. [Obs.] Blount.

other substances which causes contraction of the organic textures; as, the astringency of tannin.

the fruit of several East Indian species of acacia; neb-neb. It contains gallic acid and tannin, and is used for dyeing drab.

ve (below). -- Bark pit, a pit filled with bark and water, in which hides are steeped in tanning. -- Bark stove (Hort.), a glazed structure for keeping tropical plants, having a bed of tanner's bark (called a bark bed) or other fermentable matter which produces a moist heat.

A fragrant evergreen shrub of Chili (Peumus Boldus). The bark is used in tanning, the wood for making charcoal, the leaves in medicine, and the drupes are eaten.

Pertaining to, or obtained from, coffee. Caffeic acid, an acid obtained from coffee tannin, as a yellow crystalline substance, C9H8O4.

Pertaining to, or derived from, the tannin of coffee. Caffetannic acid, a variety of tannin obtained from coffee berries, regarded as a glucoside.

Acacia catechu, and several other plants growing in India. It contains a large portion of tannin or tannic acid, and is used in medicine and in the arts. It is also known by the names terra japonica, cutch, gambier, etc. Ure. Dunglison.

plate for taking a picture. -- Styptic collodion, collodion containing an astringent, as tannin.

, 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.

Pertaining to the tannin or nutgalls. Gallotannic acid. See Tannic acid, under Tannic.

r the name of Terra Japonica, is used for chewing with the Areca nut, and is exported for tanning and dyeing.

Pigeon's dung used in tanning. See Grainer. n., 1.

ea, a gum yielded by the Indian plants Butea frondosa and B. superba, and used locally in tanning and in precipitating indigo. -- Gum cistus, a plant of the genus Cistus (Cistus ladaniferus), a species of rock rose.-- Gum dragon. See Tragacanth. -- Gum elastic, Elastic gum. See Caoutchouc. -- Gum elemi. See Elemi.…

Pertaining to, or designating, a brown resinous substance resembling tannin, and extracted from the henna plant; as, hennotannic acid.