Detection of the use of certain azo colorants, which may release 4-aminoazobenzene; detection of the use of certain azo colorants accessible with and without extracting the fibres; determination of certain aromatic amines derived from azo colorants; chemical determination of chromium(VI) content in leather; and colour fastness to cycles of to-and-fro rubbing Method: ISO 11640, ISO 17075, ISO 14362-3, ISO 14362-1,ISO 17234-1
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