Expert Panel for Cosmetic Ingredient Safety:
The safety of 2,3-naphthalenediol has been assessed by the Expert Panel for Cosmetic Ingredient Safety. The Expert Panel evaluated the scientific data and concluded that, although there was no evidence of hazard, additional data were considered to be desirable to support the safety of 2,3-naphthalenediol as a hair dye ingredient. When new data are available, the Expert Panel will reconsider the safety of this ingredient in hair dye products.
The Expert Panel concluded that the safety of 2,3-naphthalenediol has not been documented and substantiated. The Expert Panel requested additional data to complete the safety assessment for 2,3-naphthalenediol as it is used in hair coloring products. The data that were available indicated that 2,3-naphthalenediol was slightly irritating to the eye and was a sensitizer when tested at 1%. Test data indicated that 2,3-naphthalenediol was neither a mutagen nor a developmental toxicant. A formulation containing 0.1% 2,3-naphthalenediol was not a human skin irritant. The types of data required before the safety evaluation can be completed include dermal irritation, photosensitization, and sub chronic dermal studies, as well as chemical description and impurity data.
More information about the safety of hair dyes.
2,3-Naphthalenediol is listed in the Cosmetics Directive of the European Union and may not be used as a substance in hair dye products (see Annex II).