- Apr 19, 2019
- Reaction score
I need some help understanding the various options I have for increasing the hardness and longevity of a soap, aside from the cure. Here’s what I *think* I know:
- Increasing the percentages of palmitic and stearic FAs will increase hardness and longevity, and enhance dense, creamy lather (I am not interested in increasing CO).
- Using a high percentage of OO will produce a hard soap over time. Is this a function of the high oleic acid percentage, or something unique about OO? Do the soap calculators give a reasonable approximation of longevity when the percentage of oleic acid or OO is high?
- Adding salt will increase hardness and longevity, but also reduce lather if the recipe is held constant.
- Adding vinegar will increase hardness. I have no idea how vinegar affects longevity and lather or why.
- Adding beeswax will increase hardness. Ditto what I said for vinegar, but maybe the answer is in the soap calculator or on the forum.
- Adding a small percentage of stearic acid would be similar to adjusting a recipe to have a similar percentage of stearic added via a base fat (this is going out on a limb based on my existing knowledge and no experience with stearic acid...)