I have a question – do you know of something that I can add to my M&P soap mixture (I’m using a shea butter M&P base) that will harden the soap? They come out pretty soft.
Stearic acid can be added to M&P soap to get a harder, longer lasting bar of soap. Try adding about 1 tsp of stearic acid per pound of soap. Adding any more than that, may affect the lather of your soaps. Another thing to be aware of is that stearic may make your soap slightly cloudy. As a result, stearic acid is best used in opaque soaps.