How did the Leblanc process help turn soapmaking into an industry?

The Leblanc process was instrumental in transforming soapmaking from a small-scale handicraft into a major industry by providing a reliable, inexpensive, and large-scale source of sodium carbonate (soda ash).12

Prior to the development of this process in 1790, soapmakers relied on crude methods to extract alkali carbonates from wood or seaweed ashes. Because these traditional sources were limited, the expansion of industries requiring soda ash—including soap, glass, and paper—was constrained by the high cost and scarcity of the material.12

By enabling the mass production of soda ash from common salt (sodium chloride) and sulfuric acid, the Leblanc process removed these supply barriers. This innovation, alongside later scientific advancements such as Michel Eugène Chevreul’s 1823 discovery regarding the chemistry of saponification, allowed soap production to scale significantly, ultimately fueling the growth of the modern chemical industry.3124