When the soap was invented?

Question

My daughter is grade 6 student, She asked me to provide the details about soap invention but I have no exact clue about it. Can some one provide me details.

Answer 1

 The oldest reference to the use of soap was a Sumerian recipe, dating from the third millennium BC. It is a mixture of 1 part oil and 5.5 parts of potassium. Until the beginning of s. Century Europe were used in soft soaps, made ​​from animal fat and wood ash beech and soaps made ​​from vegetable oils and soda, which was obtained mainly from seaweed. In 1810 the Frenchman Michel E. experimented at temperatures between 80 and 100 ° C using lye or fatty acids neutralized with sodium hydroxide or sodium hydroxide solutions. The "tail soap" thus obtained using the dried salt. This causes the substance to be separated to give a "soap core" and an aqueous solution of common salt or sodium hydroxide (glycerin).