Soap, which has been around forever, is one of life’s basic necessities. While the actual origin of soap is unclear, we know that for the past 5,000 years, people have been combining alkaline salt with fats to make soap. The Sumerians created a slurry by combining animal and vegetable fats with ashes and boiling the mixture. Ancient Egyptians later wrote about soap recipes that called for mixtures of fats and alkaline salts. The Romans were using bar soap in their baths by 200 CE.

The main difference between the soaps we use today and what people used way back when is that our soaps are reliably gentle on the skin and consistent ...

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