Allowed, with limits
Restricted in the EU
- What it can be used for
- Dyes hair (the functions the EU ingredient database, CosIng, lists for it; a product may use it for any of them)
- CAS number
- 608-25-3
Why it’s flagged
Allowed in EU cosmetics only with limits.
- Annex III entry 243; products: (a) Hair dye substance in oxidative hair dye products; (b) Hair dye substance in non-oxidative hair dye products; (c) Products intended for coloring eyelashes; max (b) 1.8 %; (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1,8 %; (c) After mixing under oxidative conditions the max; required warning: (a) To be printed on the label: The mixing ratio. “Hair colourants can cause severe allergic reactions. Read and follow instructions. This product is not intend. Source: EU Cosmetics Regulation, Annex III (restricted)
Annex III (restricted substances) or Annex V (preservatives) of the EU Cosmetics Regulation sets maximum amounts, allowed product types or required warnings.
What this page can’t tell you
These lists describe what a substance can do, its hazard. The risk from one product depends on how much is in it and how you use it, and the label doesn’t say how much.
Not being on a list doesn’t make an ingredient safe. It may never have been assessed.
Check your products
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Flagged the same way
Official lists checked September 2026. Spotted a mistake? Tell us.