Quote: "In lye soap there is basically two ingredients lye and fat. In the old days a ready source of fat was tallow or animal fat, lard. Today we know that animal fat cloggs the pores of the skin causing skin irrations and an oily film that the skin can't readily absorb. So now we use better sources of fat in vegetable oils, and butters, beeswax. There is recepies out there that still call for tallow but I wouldn't use them."
Sorry, but I absolutely disagree. All oils, whether vegetable or animal source, are made of the same 8 fatty acids in varying proportions. A mollecule of stearic, or any other fatty acid doesn't know if it comes from a cow or a shea nut. The chemical composition is the same either way. Any oil that is solid at room temperature has the potential to clog pores in a leave-on product such as lotion, but not when washed off in minutes. And beeswax is certainly more solid and difficult to wash off than lard or tallow.
There was a popular soap making book by Susan Miller Cavitch that maligned the use of animal fats in soaps, without any scientific basis. The nasty animal fats from rendering plants that are used in commercial soaps make a soap that isn't very special, but you don't hear about hoardes of people breaking out from Dove and Ivory. Both have a reputation as very mild gentle soaps and are often recommended by dermatologists - main ingredient in both is tallow (sodium tallowate) Food grade animal fats actaully make a very nice soap, and the same logic that dictates local honey is better than foreign, also correlates into obtaining soaping oils locally from small farms rather than from half a world away.
Here's a link where you can study and compare the fatty acid compostion of various oils.
http://www.soapcalc.com/calc/oillist.asp
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