Whale oil
(重定向自Train oil)
Whale oil is oil obtained from the blubber of whales. Whale oil was sometimes known as train oil, which comes from the Dutch word traan ("tear" or "drop").
Sperm oil, a special kind of oil obtained from the head cavities of sperm whales, differs chemically from ordinary whale oil: it comprises mostly liquid wax. Its properties and applications differ from those of regular whale oil, and it sold at a higher cost when marketed.