As for the info from Melinda Coss, I disagree on a lot of things, from greasing molds, to temperature, to the amount of lye in her recipe which will result in a superfatted soap
(a very soft, quite greasy soap that spoils quickly).
The use of a highly superfatted soap base circumvents some of these problems.
Specialty Additives in Bar Soap Formulations Additive Soap Superfatted Soap Syndet Vitamin C Rapid oxidation Slow oxidation Relatively stable Hydroquinone Rapid oxidation Slow oxidation Relatively stable Vitamin E Poor deposition Better deposition Best deposition [alpha]- Poor deposition Better deposition Better deposition Lipoic acid Benzophenone- Color formation Poor deposition Poor deposition 3 Salicylic Inactivation, Poor activity Best activity acid color Table 4.
This class of cleansers includes superfatted soaps
, combination bars ("combars"), syndet bars (composed of synthetic surfactants), and compounds that deposit lipids on the skin, such as creams, lotions, and oils.