We are a small NGO in Nepal working to help people after the recent earthquakes of 2015 and now the floods of this year's monsoon of 2017. There is a stone here that is used as an astringent/after shave when men go to the barber for a shave. Our agency would like to mold this stone into a small soap-shaped bar to sell as a fundraiser. As it turns out, it is an excellent hand sanitizer and I've used it for years, since moving to Nepal 7 years ago. This is the same stone being used for deodorant bars. It is called alum stone or fitkiri.
We will be ever so grateful for any suggestions. It melts at a low temperature, but we cannot get it to hold together as it solidifies. Every time I have shown a guest the stone they've been eager to have one. If we can mold it into a small shape it will help to keep many people from getting the typical traveler's stomach upset. This is even more important for people going up into the Himalayas.