Smithson Tennant (b. November 30, 1761, Selby, England - d. February 22, 1815, Boulogne, France) invented bleaching powder, calcium hypochlorite. Bleaching was also introduced in the manufacture of paper enabling the use of colored rags as well as white ones.
Smithson Tennant was an English chemist. Tennant is best known for his discovery of the elements iridium and osmium, which he found in the residues from the solution of platinum ores in 1803. He also contributed to the proof of the identity of diamond and charcoal. The mineral tennantite is named after him.
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