Even the superfatted soaps have the capability to transfer sodium or potassium cation from the soap molecule to a newly introduced additive that is more acidic in nature than the free fatty acids present in that soap.
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.