DIN EN ISO 20433:2013-01

This International Standard specifies a method for determining the amount of colour transferred from the surface of coloured leather to other surfaces by rubbing with a white cotton cloth. Two tests are carried out, one with a dry rubbing cloth and one with a wet rubbing cloth. The method is applicable to all types of coloured leather. Since after treatments of the leather as well as surface finishes can affect the degree of colour transfer, the test can be made before and/or after such treatments. Specimens of leather are rubbed with a dry or wet rubbing cloth attached to a cylindrical finger that is moved to and fro under controlled conditions. Colour transferred to the white rubbing cloth is assessed with the grey scale for staining. The general colour fastness testing principles shall be in accordance with those described in ISO 105-A01. It shall be taken into account that the substrate is leather. This document (EN ISO 20433:2012) has been prepared by Technical Committee CEN/TC 289 "Leather", the secretariat of which is held by UNI (Italy) in collaboration with the "International Union of Leather Technologists and Chemists Societies (IULTCS)". The responsible national committee is NA 062-05-51 AA "Anforderungen und physikalische Prüfverfahren für Leder und seine Ausgangsprodukte" ("Requirements and physical test methods of leather and ..."), mirror committee of CEN/TC 289 "Leather" at the Materials Testing Standards Committee (NMP) at DIN.