Simply Clean Soap Flakes are manufactured by a process called saponification. The term saponification is the name given to the chemical reaction that occurs when a vegetable oil or animal fat is mixed with the strong alkali, sodium hydroxide, and heated. The products of the hydrolysis reaction are soap and glycerol. Once the soap solidifies it is ground into flakes. We use only natural, plant and/or animal fats to create our soap flakes.