MATERIALS AND METHODS FOR CREATING CUSTOMIZED COMPOSITIONS HAVING A TEMPORARY VISUAL INDICATOR

摘要

The present invention relates to novel compositions, which provide an indicator for location and/or concentration of the composition during application. Following application, the indicator is no longer visible to the user. In one embodiment, the indicator is a compound that is visible at a first pH and not visible at a second pH. In another embodiment, the indicator is a photosensitive or light unstable dye, where the dye is visible for a temporary period following exposure to light.