Destructive distillation
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Destructive distillation is a chemical process in which decomposition of unprocessed material is achieved by heating it to a high temperature; the term generally applies to processing of organic mater
Hartshorn
…Various nitrogen compounds were made from hartshorn shavings: Oil of hartshorn is a crude chemical product obtained from the destructive distillation of deer antlers. Salt of hartshorn refers to ammonium carbonate, an early form of smelling salts and baking powder obtained by dry distillation of oil…
Pliny the Elder