Laboratoires Osma's alum is the world's best potassium alum for use as a post-shaving astringent or a natural deodorant, and they are entirely made by hand in Craponne, France. Laboratoires Osma's alum stones wear away evenly, without breaking down in a granular fashion, and they contain a higher percentage of weight in water than any other alum stone on the market, which makes their application both upon the face and under the arms more comfortable. This stone is approximately 100 grams of net weight and is hand-formed into a cylinder shape. It can be used for either post-shaving or for deodorant use; these do not come with instructions, but the use is rather straightforward, for deodorant you apply some light amount of water to the top of the cylinder and rub on the area to be protected until the water is absorbed by the salt, while for shaving you will leave your face wet after the shave and simply gently move the stone down and around the shaved area, let sit for 30 seconds or so, and splash off with some cold water. This stone is supplied in a plastic tube case but it is not intended for travel (the company does produce other models with a more robust travel tube).
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