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Chlorate of Potassa

Transmit nals calls attention to the fact that for many chlorine gas through a moderately strong and purposes, such as for dyeing wool black, warm solution of pure caustic potassa, or its Glauber's salt and sulphuric acid can be ecocarbonate, until the alkali be completely neu- nomically substituted for bichromate of potralized, then boil for a few minutes, gently tassa. It gives the following recipe for dyeing evaporate until a pollicle forms on the surface, 100 pounds of loose wool-namely, 6 pounds and set it aside, where it will cool very slowly. sulphate of soda, 2 pounds sulphuric acid, and Crystals of the chlorate will form as the liquor 2 pounds sulphate of copper, which are to be cools, and must be collected, carefully washed boiled together for an hour, and colored with with a little ice-cold water, and purified by 40 to 50 pounds logwood, and 1 pound sulre-solution and crystallization; the product phate of copper, and finally colored black by is pure chlorate of potassa. The mother means of a little sulphate of iron. The black liquor, which contains much chloride potas- thus obtained is pronounced to be beautiful, sium, by evaporation will yield more crys- cheap, and easily spun, remaining loose and tals, less pure than the former, or it may be soft. saved for a future operation. This salt crys- 4189. Nitrite of Potassa. It is obtallizes in four and six-sided pearly scales; tained mixed with a little nitre and potash by dissolves in 16 parts of water at 60°, and in heating nitre to redness. To purify the 2½ parts at 2120. At about 450° it undergoes residuum, dissolve it in boiling water, set the igneous fusion, and on increasing the heat aside for 24 hours, pour off the liquid from almost to redness, effervescence ensues, and the deposited nitre, neutralize the free alkali fully 39 per cent. of pure oxygen gas is given with acetic acid, and add twice its volume of off and the residue becomes changed into chlo- alcohol. In a few hours more, nitre crystalliride of potassium. When mixed with in- zes, and the liquid separates into two layers; flammable substances, and triturated, heated, the upper is alcoholic solution of acetate of or subjected to a smart blow, it explodes with potash, the lower is solution of nitrate of great violence. It also fulminates when potash, which may be evaporated to dryness, thrown into strong acids. (See No. 2124.) or kept in solution. (Beasley.) (Cooley.)

Or, pass nitrous acid gas, formed by acting on 1 part of starch with 10 of nitric acid, through a solution of caustic potash, specifie gravity 1.38, until it becomes acid; then add a little caustic potash, so as to render it distinctly alkaline. It may then be kept in the liquid form, or evaporated to dryness. (Corenwinder.) This consists of slender, prismatic crystals,