Improvements in the Manufacture of Pearl Hardening or Satin Spar
1577. Brothers, W., and Brothers, W. M. Jan. 20. Calcium sulphate.-Gypsum or other natural or waste calcium sulphate is treated by boiling with hydrochloric acid either in an open vessel or under pressure. Finely-crystalline calcium sulphate, such as pearl hardening or satin spar, such as is used in...
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