Chapter 3 103 forms a stable multiphase system that becomes temporarily uniformly dispensed upon agitation.79 Multiphase cleansing products have been introduced that go beyond mere phase separation insofar as the separate phases can be arranged to form visually attractive patterns inside a transparent container.80 The phases comprise an aqueous cleansing phase, a benefit phase, and a non-lathering structured phase. The aqueous cleansing phase must be capable of adequate lathering.81 The benefit phase comprises hydrophobic component(s) or conditioning components. These products are designed at the nanoscale: the structured phase can be a lamellar-phase formed by adding sufficient electrolytes to an appropriate surfactant. Structurants such as starch have been used in personal cleansing formulations,82 but the surfactant itself can be structured. Thus, lamellar phase does exhibit a yield stress that is sufficient to stably suspend the benefit phase. However, the yield stress of lamellar phase can vary dramatically with temperature, and, in order to overcome this problem, the cleansing and benefit phases were density matched by adding microsphere particles to reduce the specific gravity of the cleansing phase or high density particles to the benefit phase to increase its specific gravity. In this context, it is interesting that it has been recently disclosed that controlled phase separation and deposition could conceivably be achieved by loading the desired “active” phase into hollow-sphere polymer carriers,83 and again it has been reported that certain cationic guar derivatives can enhance the deposition of conditioning additives and/or solid particle benefit agents.84 Lamellar phase, especially if it is made from unneutralized long- chain fatty acids, usually displays poor dispersion kinetics and a lather that is slow to build up or slow to rinse off. However, if has surprisingly been discovered that swollen lamellar gels can exhibit both high product viscosity and fast dispersion kinetics if they are formed by combining C16-24 normal monoalkylsulfosuccinates with n-alkyl fatty acids of approximately the same chain length.85 In