TAR′RAS. Syn. Terras. A volcanic product resembling puzzolano, that imparts to mortar the property of hardening under water. Several other argillo-ferruginous minerals possess the same power, and are used under this term.
TAR′TAR. Syn. Argal, Orgol; Tartarum, Tartarus, L. Impure bitartrate of potassa. Crude tartar is the concrete deposit formed upon the sides of the casks and vats during the fermentation of grape juice. That obtained from white wine is white argol; that from red wine, red argol. After purification it forms cream of tartar.
Tartar, Ammo′′niated. Syn. Ammonio-tartrate of potassa, Soluble tartar (Ammoniated); Tartarus ammoniatus, Tartarum solubile ammoniatum, L. Prep. Neutralise a solution of cream of tartar with ammonia in slight excess, then evaporate, and crystallise. Very soluble in water. A favourite laxative on the Continent.
Tartar, Bo′′raxated. Syn. Soluble cream of tartar, Boro-tartrate of potassa and soda; Tartarum boraxatum, Cremor tartari solubilis, Potassæ et sodæ tartras boraxata, L. Prep. From borax, 2 lbs; cream of tartar, 5 lbs. (both in powder); dissolved
in water, evaporated, and crystallised. See Potassium Borotartrate.
Tartar, Chalybea′ted. Potassio-tartrate of iron.
Tartar, Cream of. Bitartrate of potassa.
Tartar, Emet′ic. Potassio-tartrate of antimony.
Tartar, Oil of. Deliquesced carbonate of potassa.
Tartar, Reduced. Syn. Cremor tartari reductus, L. An article is sold, under the name of ‘British cream of tartar,’ which contains 1⁄4 its weight or more of bisulphate of potassa.