Direct oxidation tests on soap

1. A direct method for quantitative estimation of peroxide content in dry and hydrated soaps and cosmetics is proposed. 2. Different methods of exposing the samples are discussed. 3. Soaps of different kinds are compared under similar conditions. 4. Development of peroxides in soaps is compared with their respective oils. 5. The influence of free alkali and unsaponified fatty matter is considered. 6. The influence of some chemicals mentioned in literature as antioxidants is tested. 7. We do not consider this experimental series as final, and further utilization of the proposed methods for the investigation of the factors mentioned in this paper and other factors influencing soap is to be made.