Method for assessing the effectiveness of skin washing

Abstract

The invention provides a method for assessing the effectiveness of skin washing in a subject, comprising the steps of: (a) applying a patch on or over a target area of the skin of a subject before washing of the target area, followed by (b) assessing the appearance of the patch after washing of the target area; in which the patch comprises a pH sensitive indicator which is designed to undergo a visually perceptible change in colour when contacted with an alkaline composition, such as soap or other anionic surfactant, during washing of the target area, and in which assessment of the appearance of the patch after washing provides an indication to the assessor whether an alkaline composition, such as soap or other anionic surfactant, has or has not been used to wash the target area.