Potassium hydroxide (often called “potash”) makes liquid soap – flowing, clear or translucent liquid soap
Potassium hydroxide heats up significantly when you add it to the water to make the lye solution
potassium hydroxide lye solution gets so hot that it almost boils. The flakes kind of bubble and rattle in the bottom of the pitcher.
As with any lye solution, be sure that you are wearing proper safety gear – gloves and goggles and long sleeves – and that there are no children, pets, spouses, etc. to distract you when you’re making your lye solution.