Alum Stone is a wonderful crystal when it comes to skin tightening.Men who use Alum Stone as aftershave gets their face tightened automatically.Use alum for face skin tightening lifting and removing wrinkles How to use Alum Stone for face skin tightening and lifting Wash your face but don't' dry it.Wet Alum Stone in cold water thoroughly and rub gently across skin. Alum is also used in anti aging products where it is the main ingredient.