UNE-EN ISO 11641:2026

This document specifies a method for determining the colour fastness to perspiration of leather of all kindsat all stages of processing. It applies particularly to gloving, clothing and lining leathers, as well as leatherfor the uppers of unlined shoes.The method uses an artificial perspiration solution to simulate the action of human perspiration. Sinceperspiration varies widely from one individual to the next, it is not possible to design a method withuniversal validity, but the alkaline artificial perspiration solution specified in this International Standardwill give results corresponding to those with natural perspiration in most cases.NOTE In general, human perspiration is weakly acidic when freshly produced. Micro-organisms then cause it tochange, the pH usually becoming weakly alkaline (pH 7,5 to 8,5). Alkaline perspiration has a considerably greatereffect on the colour of leather than has acid perspiration. Therefore, for coloured leather, an alkaline perspirationsolution is used to simulate the most demanding conditions encountered in practice.