Patent ID: 7850911

Claim:
A method for testing the capacity of a moisture containing cleansing article to neutralize alkalinity of residues on human skin and to restore natural pH of skin, by evaluating the pH and buffering potential of the moisture containing cleansing article, the method comprising the steps of: providing the moisture containing cleansing article, wherein the moisture containing cleansing article comprises a fibrous substrate and a lotion disposed on the fibrous substrate; providing a test substrate for simulating human skin with the alkaline residues, the test substrate comprising a surface, and a visual pH indicator and a pH buffer disposed on the surface of the test substrate; wiping the surface of the test substrate with the moisture containing cleansing article, wherein the pH buffer is adapted to modify the ability of the lotion to maintain pH of human skin by shifting its acid-base equilibrium to simulate interaction of the lotion with the alkaline residue, and further wherein the visual pH indicator changes color at a pH above 4.0, and is adapted to indicate the final pH of the lotion that interacted with the pH buffer; and determining the pH response for the moisture containing cleansing article based on the color change of the pH indicator.