Alum stone for after shaving The alum or potassium alum is a mix of aluminum and potassium salt of sulfuric acid, at room temperature it looks colorless, solid and completely natural. This one is also odorless. It is a perfect after-shave ally thanks to its astringent and haemostatic properties.
This natural mineral is also used as a natural hypoallergenic.
How do you use No. 409 After Shave Astringent Stone?
1. Wet the skin with cold water and gently rub the alum stone onto the shaved area.
2. Leave on for a few seconds and splash face with warm water.
3. For best maintenance of the stone, pat dry after use.
Potassium alum, mineral present in nature with an astringent action