Terms and Definitions
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Planishing (from the Latin planus, "flat") is a metalworking technique that involves finishing the surface by finely shaping and smoothing sheet metal.
Bromoform a chemical for separating topaz and quartz.
Only small quantities of bromoform are currently produced industrially in the United States. In the past, it was used as a solvent, sedative and flame retardant, but now it is mainly used as a laboratory reagent, for example as an extraction solvent.
Bromoform's high density makes it useful for separation of minerals by density. When two samples are mixed with bromoform and then allowed to settle, the top layer will contain minerals lighter than bromoform, and the bottom layer will contains heavier minerals. Slightly less dense minerals can be separated in the same way by mixing the bromoform with a small amount of a less dense and fully miscible solvent.
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