What is whale sperm foam?

Whale sperm foam, also known as "spermaceti," is a white, waxy substance found in the head cavities of some species of whales, particularly the sperm whale. It was historically used in the production of candles, cosmetics, and lubricants. However, the use of sperm whale products is now banned due to concerns about the conservation of whale populations. Modern alternatives to sperm whale oil and spermaceti include jojoba oil and synthetic substitutes.