2,3-Diaminodihydropyrazolopyrazolone Dimethosulfonate in EU cosmetics: Annex III, entry 279
2,3-Diaminodihydropyrazolopyrazolone Dimethosulfonate: the table gives no maximum concentration for this entry; the restrictions are in its conditions and wording. Annex III, entry 279, Regulation (EC) No 1223/2009, consolidated 18 May 2026.
- Annex
- III: List of substances which cosmetic products must not contain except subject to the restrictions laid down
- Reference number
- 279
- Chemical name/INN
- 2,3-Diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a] Pyrazol-1-one dimethanesulfonate
- Name of Common Ingredients Glossary
- 2,3-Diaminodihydropyrazolopyrazolone Dimethosulfonate
- CAS number
- 857035-95-1
- EC number
- 469-500-8
- Version
- Consolidated version of 18 May 2026
- Official source
- Regulation (EC) No 1223/2009, consolidated text
Official wording: restrictions
- Product type, body parts: Hair dye substance in oxidative hair dye products | Other: After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 2,0 %
Official wording: conditions of use and warnings
To be printed on the label:
The mixing ratio.
‘ [pictogram in the official text] Hair colorants can cause severe allergic reactions.
Read and follow instructions.
This product is not intended for use on persons under the age of 16.
Temporary “black henna” tattoos may increase your risk of allergy.
Do not colour your hair if:
- you have a rash on your face or sensitive, irritated and damaged scalp,
- you have ever experienced any reaction after colouring your hair,
- you have experienced a reaction to a temporary “black henna” tattoo in the past.’
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