superfatted soap

su·per·fat·ted soap

soap containing an excess (3-5%) of fat above that necessary to completely neutralize all alkali; used in the manufacture of medicated soap, and in the treatment of skin diseases.
Farlex Partner Medical Dictionary © Farlex 2012
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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.