When making soap using a cold process method, it can difficult to get the proper measurements of lye and oil. Too much lye will burn the skin. Too much oil will make the soap greasy and ineffective. So how can you determine a soap’s pH to see if it’s safe for the skin? Grab a red cabbage from the fridge!

Take the red cabbage, chop off 3-4 leaves, and place it in a bowl of distilled water. Blend it and strain out the juice. Place a drop of red cabbage juice onto the bar of soap. If the juice changes colors from purple to blue, your soap is safe to use. If the color changes to green or yellow, then there is too much lye. For a full picture tutorial of this method, click here:: How to Test pH with Red Cabbage