This document specifies a method for determining chromium(VI) in solutions leached from leather under defined conditions. The method described is suitable to quantify the chromium(VI) content in leathers down to 3 mg/kg. This document is applicable to all leather types. The results obtained from this method are strictly dependent on the extraction conditions. Results obtained by using other extraction procedures (extraction solution, pH, extraction time, etc.) are not comparable with the results produced by the procedure described in this document. If a leather sample is tested with both this document and ISO 17075-2, the results obtained with ISO 17075-2 are considered as the reference. The advantage of the method described in ISO 17075-2 is that there are no interferences from the colour of the extract. Nevertheless, interlaboratory trials do not show significant differences (see Annex C) and the results are comparable between both methods.st edition 2017-02 Leather — Chemical determination of chromium(VI) content in leather — Part 1: Colorimetric method Cuir — Détermination chimique de la teneur en chrome(VI) du cuir — Partie 1: Méthode colorimétrique Reference numbers ISO 17075-1:2017(E) IULTCS/IUC 18-1:2017(E) ？ ISO 2017 ISO 17075-1:2017(E) IULTCS/IUC 18-1:2