What is Lye? Lye is a key ingredient in soap making.  It is a strong alkali or base substance which reacts with fat to form soap.  You can buy lye in the form of caustic soda (sodium hydroxide) or you can make your own homemade lye in the form of caustic potash (potassium hydroxide). Firstly lets get the health and safety stuff out of the way.  All lye is extremely corrosive.  Keep your skin covered, wear goggles to avoid splashes to eyes and definitely keep all lye out of the reach of children and pets.  It can be fatal if […]