I've experimented with different soap recipes and additives. Animal fats, different vegetable fats, and different liquids - coffee, beer, animal milks. I don't think I'm a big fan of animal milk soaps at least for unfragranced. They have a faint 'barn yardy' smell. A kind of grass, hay, earthy smell when I use it in the shower. Animal fats make a nice soap, but I think I'm going to try to stick to vegetable fats. Not that I'm vegan or even vegetarian, but I don't see a super need to use animal fats. It's always there as an option if I want to use it in the future.
So what's up next? I would like to try coconut milk for the liquid. I can't imagine it would have that same 'barn yardy' smell as animal milks. Or actually any non-animal milks (almond, rice, soy, etc) would be worth a try. I'd like to also try pureed carrots or cucumber. Those might be interesting additives.
I took a look at the Key Lime Pie Soaps. The tops are continuing to turn more brown while everywhere else seems to be keeping it's color. It's been 2 weeks. I think it's really interesting that only the tops are turning brown like the tops have a fine dusting of cocoa powder. Will the vanilla color stabilizer continue to work with the rest of the soap? Hmm.... stay tuned.