I never had soda ash until I started using lard and cocoa butter in my soap. I got really bad ash on 40% lard, 30% HO sunflower, 15% coconut, 10% olive and 5% castor with 1.8:1 water to lye, but I think I should have blended it more.
I like to use up to 3% kaolin clay so I´m not sure how low I...