What was my disappointment once order placed, to come across plenty of articles explaining that to create stone Alum synthetically, companies use aluminum clorohydrate. Now there are plenty of scientific studies that show the hyper harmful effects of this substance, which would cause a vengeance cancers (go check it yourself if you do not believe me)
And there, SURPRISE! Wikipedia tells me that there are still A laboratory in France that produces handmade Alum ... And guess what? Yes, the laboratory Osma if present. Relief, and double pleasure of using a traditional product.
So you can go there and order without making you worry!