| Abstract: | Resistance of soap to hardness of water as reflected by its ability to lather in hard water has been tried as as analytical parameter to assess the quality and hence effectiveness of the soap. The resistance of a soap to hardness of water can be considered to be the sum total effect of four factors: 1. Composition of the fat base, 2. solubility of the soap at the washing temperature, 3. polymorphism of soap crystals and 4. nature and proportions of additives in the soap. The method thus helps in assessing the quality of the soap with regard to these factors and in working out the economics of its use. |
