Alum stone is a good aftershave in wet shaving, and a good preshave in electric shaving. At the same time, it is also an effective and inexpensive deodorant, the benefits of which are already praised by Pliny the Elder in his Natural History. To do this, lightly moisten the crystal and pass it over the skin.
Alums are natural potassium aluminum sulfates that reliably bind the smell of sweat. In many other deodorants, this task is performed by other aluminum salts such as aluminum hydrochloride or ammonium, which are not included here. Nevertheless, we recommend using it only on healthy, uninjured skin. Do not use directly after shaving, if you shave the underarm hair, just do it the night before.