Hard toilet soap with a pleasant smell was produced in the Middle East during the Islamic Golden Age, when soap-making became an established industry.
Archaeologists have found this soap-like material in ancient clay cylinders from the time. These ancient peoples had started to cotton on to the fact that it was the combination of the ashes and the grease which was making the mixture an effective cleaning agent. The clay cylinders were inscribed with what we understand as saying, “fats boiled with ashes”; the earliest known soap recipe.

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