safrole
noun
a colorless or faintly yellow liquid, C 1 0 H 1 0 O 2 , obtained from sassafras oil or the like: used chiefly in perfumery, for flavoring, and in the manufacture of soaps.
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The removal of safrol, either intentionally or by accident, owing to cooling of the oil and consequent deposition of the safrol, is readily detected by the reduction of the specific gravity below 1.06.
From The Handbook of Soap Manufacture by W. H. Simmons