METHOD FOR EVALUATING AND MEASURING THE APPARENT OR PERCEIVED QUANTITY OF HAIR IN A WICK HAVING POSSIBLE HAIR TREATMENT

摘要

The present invention relates to a method for evaluating and measuring the apparent or perceived quantity of hair in a lock (300) having possibly been the subject of a prior hair treatment, said method comprising the steps aimed at: - placing a lock of hair through an opening (102) of an iris optical diaphragm (100), - progressively reducing the opening diameter of the iris while measuring the closing tension of said diaphragm as a function of its diameter closure around the wick.