Leather - Chemical tests - Determination of Chromium (VI) and the reductive potential for chromium tanning agents (ISO/DIS 19071:2014); German version prEN ISO 19071:2014
Leather - Chemical tests - Determination of chromium(VI) and the reductive potential for chromium tanning agents (ISO 19071:2016); German version EN ISO 19071:2016— 12 стр.