Contact allergens in ‘natural’ hair dyes

Table S1. Contact allergens identified on the ingredient labels of 26 oxidative hair dye products, from four different product series. The products were either advertised with the signal words organic, natural, or similar, or sold/used at a hairdressing salon advertised with the same terminology. Contact allergens are presented in descending order, starting with the most frequently found. Table S2. Contact allergens identified on the ingredient labels of 35 non-oxidative hair dye products, from five different product series. This group consisted of semipermanent hair dye products and so-called herbal hair colours. The products were either advertised with the signal words organic, natural, or similar, or sold/used at a hairdressing salon advertised with the same terminology. Table S3. Signal words and certifications identified on the package of the studied hair dye products (n = 92) and in the marketing of hairdressing salons. All hyperlinks last accessed 22 May 2015. Table S4. Botanicals identified on thelabels of the studied hair dye products (n = 92), regardless of allergenic properties. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.