Regulatory data is for reference only. Always verify with the official regulator before making formulation decisions. Last refreshed: 7/12/2026.

Ingredients/4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products

4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye productsCAS 2051-85-6

EU CosIng Annex II — prohibitedEU CosIng Annex IV — colorant

Regulatory status

SourceStatusAnnex / DetailsLimit / ConditionsLast updated
EU CosIngprohibitedAnnex II—
EU CosIngcolorantAnnex IV—

What this means

4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products has regulatory signals in EU CosIng and EU CosIng. Review the source links above for the official conditions and latest updates.

Common questions

Is 4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products restricted in EU cosmetics?
4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products is prohibited in EU cosmetics according to EU CosIng Annex II.
What is the CAS number for 4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products?
The CAS number for 4-(Phenylazo)resorcinol (Solvent Orange 1; CI 11920) and its salts, when used as a substance in hair dye products is 2051-85-6.

Get the full 27-market profile

Sign up free to unlock GHS hazards, FDA, Canada, ASEAN, China, Japan, Korea, UK, and more.

Sign up freeRun another search