Soap production is a massive industry that serves millions of consumers worldwide. In this video, we take a behind-the-scenes ...

Hot process. In hot process soap-making, external heat accelerates saponification. Most soaps can be used the next day, though it’s ideal to wait 1 week if you want a harder bar. Cold process.

The film details the process of soap making, starting with Carl Mason's laboratory demonstration using fat and sodium hydroxide (lye). It explains the chemical reaction known as saponification ...