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Tartrate of Potassa

Dissolve the ferrocyanide of potassium of commerce. 8 ounces carbonate of potash in 2 quarts In order to obtain a pure article, fuse efflodistilled water; whilst boiling hot, add gradu- resced commercial prussiate of potash in a ally 1 pound, more or less, of bitartrate of glass vessel, dissolve the fused mass in water, potassa (cream of tartar) in fine powder, neutralize any excess of alkali with acetic until the solution is neutralized, or ceases acid, and precipitate the salt with strong alto change the color of either blue or red-cohol; wash the precipitate with a little weak dened litmus paper. Filter through muslin, alcohol, redissolve it in water, and crystallize. and evaporate until a pellicle forms on the (Cooley.) surface; then set it aside to crystallize. After 4202. Cyanide (Cyanuret) of Potas- 12 hours, collect the crystals, dry them on bibulous paper, and keep preserved from the air.