Shape not very suitable for use as deodorant

Apparently, it's really natural alum. The appearance is in any case very different from synthetic alum block I used before.
It is sold as aftershave rather than deodorant. I do not know if it's because of suspicions about the potentially carcinogenic effects of small amount of aluminum it contains. Using that seemed to me the safest and most convenient is to use it before the shower, not wear it and hold on the skin. It is effective like that, because it kills bacteria.
In any case, it happens in the form of a cuboid shapes acute. I had a smooth stop at the Gratounette dish to use it under the arms.