Thread: Alum

I had a recipe years back. It used alum or Chrome alum, the chrome alum meant the finished skins were machine washable. A deer skin I tanned in 1992 is still looking good (except where the Jack Russell had a chew...).
I bought the chrome alum from the chemist, it came in 500g tubs. The recipe included flour and olive oil, and I think salt. The flour was to turn it into a paste, oil would have been as an emulsifier.