Use: Wet the alum rock and rub the areas that generate sweat.
Alum rock is a crystal and as such you should avoid hitting hard surfaces.
Interesting facts: Since 1248 BC, the Chinese and Egyptian cultures used this product to prevent body odor without damaging the skin. around 100 BC, the Romans used alum crystals for the same purpose, calling it Alumen Romanum.
In 1458, Giovanni de Castro founded the famous alum factory in the Baticano. In the 15th century there was already a large number of alum factories in Germany.
The Spaniards brought the alum to America shortly after the voyages of Christopher Columbus. In some countries in Europe and Asia, alum has continued to be used as a natural deodorant, which increases with new trends that favor the use of natural products.