Interestingly, soap was made in ancient Sumeria and Babylon (about 2800 BC). Descriptions of soap making techniques are found in Mesopotamia on clay tablets dating back to around 2200 BC. e. Egyptian papyrus from the middle of the second millennium BC indicates that the Egyptians regularly washed themselves with soap. Similar detergents were widely used in ancient Rome. Legend has it that the Latin word lat. sapo (soap) comes from the name of Mount Sapo in ancient Rome, where sacrifices were made to the gods. The animal fat released during the burning of the victim accumulated and mixed with the wood ash of the fire. The resulting mass was washed off by rain into the clay soil of the banks of the Tiber River, where residents washed their clothes and, naturally, the observation of a person did not miss the interesting fact that thanks to this mixture, clothes were washed much easier.  In 1808, the French chemist Michel Eugene Chevreul (1786−1889), at the request of the owners of a textile factory, established an interesting fact that soap is a sodium salt of a higher fatty (carboxylic) acid.