This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 Excerpt: ...is ignited, various volatile substances are evolved, and the residue in the crucible is a mixture of charcoal and carbonate of potash, and is denominated black flux (fluxus niger). "If made with raw tartar, which contains nitrogen, it is contaminated with bicyanide of potassium" (Turner). By roasting, the charcoal is burnt off, and nearly pure carbonate of potash is obtained from the residue by lixiviation. The carbonate thus produced is called salt of tartar (sal tartari). It is comparatively pure. By deflagrating a mixture of equal parts of bitartrate of potash and nitrate of potash we obtain bitartrate of potash contaminated with hyponitrite and even with some undecomposed nitrate of potash. The residue is called white Jlux (fluxus albus). By deflagrating a mixture of nitre and charcoal we obtain what is called fixed nitre (nitrum Jixum). The high price of pearlash has occasionally led to the manufacture of carbonate of potash from sal enixum (bisulphate of potash), by heating it in a reverberatory furnace with charcoal. This yields a sulphuret of potassium, in consequence of the carbon deoxidising the bisulphate. By roasting, this sulphuret is decomposed, and converted into carbonate of potash; the sulphur being dissipated, and the potassium combining with oxygen and carbonic acid. Mr. Spence, of Manchester, has improved upon the process of procuring carbonate of potash, by passing carbonic acid into solutions of sulphuret of barium and sulphate of potash at the ordinary temperature, having previously raised the temperature of the gas to 200 Eahr. By this means the decomposition is effectually accomplished. The sulphate of baryta deposited may be reconverted into sulphuret of barium with carbonaceous matter in the usual way.1--Ed. Properties.-...