(09-04-2016, 04:07 PM)explodyii Wrote: After getting into soapmaking (the hand & body variety), I've really come to understand the ingredients list on soaps a lot better.
For me, if it has stearic acid as its first ingredient, I pass on it. Some soaps with this characteristic do work for me, but it's uncommon (like Barrister & Mann, Grandstaff Soap Co, and Soap Commander.) If it only uses Potassium Hydroxide for lye, I pass on it. I've never tried one like that which gave me enough cushion.
Two basic rules to keep me buying what actually works for me, and interestingly enough, it seems 90%+ of new stuff doesn't pass those checks.
MdC has good cushion and only uses potassium hydroxide.
I personally don't mind stearic as the first ingredient and just made a shave soap this week with it first, and shea butter second and it worked out very well. Oils and butters have different amounts of fatty acids, and some contain more stearic acid than others. If you use enough oils that are high in stearic acid then it's probably not necessary to add as much stearic to the recipe. Yet if using oils that don't have much stearic in them it would be beneficial to add more stearic acid. I wanted a fairly high percentage of stearic in my recipe for lather stability and hardness, so that's my reasoning. Shea butter has a very high stearic content, so between stearic and shea my soap has plenty. I was making up for the very low (nearly nonexistent) stearic in castor and coconut.
I have no idea if shave soap makers look at is this way but I am. Most of the artisan soaps I use have a high percentage of stearic, and many include a lot of butters which are also high in stearic, especially kokum. Thus, it turns out all of my favorite soaps are high in stearic. Some lead off with tallow but tallow is also high in stearic, and usually it's followed be stearic. Vegan soaps like MdC have very high stearic because the only other oil in a lot of them is coconut, which has very little stearic. That's my 2 cents anyway. I've been making bath soaps for a year now but only recently started experimenting with shave soaps.