where do you get lye
Making lye from wood ash. Lye made from wood ash is potassium hydroxide, not sodium hydroxide -- there's 10 times as much potassium as sodium in wood ash. The process makes lye water.If you boiled off all the water you could use it as the catalyst to make biodiesel, but you'd need more accurate pH measures than those listed below.aking lye from wood ash. Lye made from wood ash is potassium hydroxide, not sodium hydroxide -- there's 10 times as much potassium as sodium in wood ash. The process makes lye water.