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...) TIA for any useful threads or insights you can provide.