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To Obtain Pure Baryta

Ignite tests distinguish it from the other earths, and pure crystallized nitrate of baryta in a capa- its insolubility in alkaline solutions marks its cious porcelain crucible, until red vapors difference from alumina. cease to be evolved. This forms a grayish 3993. Lime. A highly acrid, alkaline white mass or powder, which, on the addition and caustic earth, less insoluble in cold than of water, slacks like lime, but with the evolution of more heat.