soaps are made form a fat or fatty acid and an alkali. they lather and produce a foam which entraps dirt and grease. there are many kinds of soaps. cleaners contain a solvent, such as naphtha, with or without a soap. abrasive cleaners are soap pastes containing powdered pumice, stone, silica, etc glycerin/4 water/11 red oil (oleic aicd)/4 solid caustic potash/1 concentrated liquid soap
配制方法:
dissolve the caustic soda in water, add the glycerin, and bring to a boil in an enamelled pot. remove from the heat, add the red oil slowly, while stirring. if a more neutral soap is wanted, use more red oil.