Spermaceti (Spermacetum; synonym Cetaceum), a substance obtained from the liquid contents of the so-called spermatophore bag of sperm whales. White solid mass with a temperature of melting 45-54 degrees. Used as a basis for ointments. Hardness and relatively high melting point allow the use of spermaceti as seals too soft for mazevyh bases. Store in closed containers, protected from light place.