| 摘要 |
An exemplary system and method for providing a handwash composition that changes color after a substantially predetermined period of time is disclosed as comprising colorant particles suspended in a surfactant solution. The colorant particles are configured to rupture after a given amount of time of exposure to shear forces resulting from the mechanical agitation of the surfactant to produce a lather. Upon rupture (or alternatively, adequate abrasion) of the colorant particles, the user observes that the soap lather has changed color-thus indicating that a sufficient amount of time has elapsed and that the hand washing activity has likely achieved its intended purpose.
|
