Collage of 3 soaps brother tested for blacksmith soap in summer of 2016. Borax, Pumice, and a combo of the two. He found the combination of Borax & Pumice to be most effective as a Blacksmith soap.
Test soap for Blacksmith brother. One of three soaps to try. This one had Borax; another had pumice only; the third had both Borax and pumice.
https://www.soapmakingforum.com/threads/borax-hand-soap-for-blacksmith-or-other-dirty-work.61277
Another one of the Blacksmith soaps I made for my brother. DB is the fragrance.
https://www.soapmakingforum.com/threads/borax-hand-soap-for-blacksmith-or-other-dirty-work.61277/
Soap I made for my brother, the blacksmith. The recipe was designed for him, based on his feedback from different formulas I tested. It is the combination of finely ground pumice plus Borax that makes this soap his favorite for cleaning blacksmithing stains. DB is the fragrance.