This is an essential ingredient for handmade solid e soap. Ours comes in flake form so it's easy to measure and add to your recipe. Usage Instructions: Lye can be dangerous if it's not handled properly. Learn how to work with it safely before getting started. Find out how much to use in your recipe with the Lye Calculator. With safety gear on, gloves, goggles, long sleeves, carefully measure the lye into a glass container. Measure distilled water or other liquid into a separate container. Slowly pour the lye into the liquid, never the other way around, and stir until it's dissolved. Let cool and then pour into oils.