The Swiss certification company said aniline-reduced indigo is now a must for bluesign-approved indigo. Aniline is restricted in other dyes and auxiliaries with a limit of 500 mg/kg.

This is based on concerns such as the U.S. Environmental Protection Agency classifying aniline as a Group B2 probable human carcinogen and its toxicity to the natural environment, Bluesign said.

Other revisions incorporate new scientific knowledge on the toxicological and ecological profile of substances, new legal classification of chemical substances, new legal consumer safety limits, revised risk assessments based on the bluesign criteria for chemical assessment, feedback from experts of the Chemical Expert Group (CEG) as well as new analytical standards.