Most masks can be left on for 15 to 30 minutes. If your mask contains any drying or acidic ingredients like clay or lemon juice,
be careful not to leave it on any longer than 15 minutes.
If you find a homemade mask to be too slippery or wet, try adding a dry ingredient like oatmeal, oat flour, rice bran powder, or adzuki bean powder.
Gentle masks can be used every day, but any recipes that include drying or acidic ingredients like clay or lemon juice should be limited. Strong clays, like French green, green Illite, rhassoul, and multanni mitti (also known as fuller’s earth), should be used once a week at most.
Excerpted from The Natural Beauty Solution by Mary Helen Leonard. Copyright © 2015 by Mary Helen Leonard and Spring House Press.
Illustration by Chloe Bulpin, mbg creative