While whale oil had initially been used for lighting, the discovery of petroleum in the mid-19th century led to a decline in its use for this purpose. However, new markets for whale oil emerged, particularly in the production of soap and margarine.
Scientists working for Lever Brothers developed methods to deodorise and harden whale oil, making it suitable for large-scale margarine production. Lever Brothers, through its dominance in the margarine market, became a major buyer of whale oil, driving demand and fuelling the expansion of the whaling industry.
Whale oil also became a critical ingredient in soap production as hygiene practices became more widespread. This demand fuelled the continued expansion of the whaling industry, even as concerns about overexploitation grew.