Is CI 18820 safe in cosmetics?
CI 18820 has a safety rating of "MODERATE" in our database. EU status: permitted. US status: prohibited.
Moderate
Cosmetic Ingredient
CI 18820
Also known as: Acid Yellow 11, Benzenesulfonic acid, 4-[4,5-dihydro-3-methyl-5-oxo-4-(2-phenyldiazenyl)-1H-pyrazol-1-yl]-, sodium salt (1:1), Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, sodium salt, 4-(3-hydroxy-5-methyl-4-phenylazopyrazol-2-yl)benzenesulphonate, EINECS 228-808-0 (+4 more)
CI 18820 (CAS 6359-82-6) is a cosmetic cosmetic ingredient functioning as Colorant. EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
View industrial chemical safety profile for CAS 6359-82-6 →
Auto-generated CPSR Part A draft with source citations
Function
Colorant
Safety Rating
MODERATE
Chemistry & Identifiers
IUPAC Name
sodium 4-(3-methyl-5-oxo-4-phenyldiazenyl-4H-pyrazol-1-yl)benzenesulfonate
InChIKey
UDTJJVCMRRCRDB-UHFFFAOYSA-M
Regulatory Status
EU EU Status
permitted
US US Status
prohibited
US Notes
Delisted by FDA in 1967 (Ext. D&C Yellow No. 3); formerly approved for external drugs and cosmetics; delisted due to lack of interest; 21 CFR 81.30; not permitted for use in the US
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for CI 18820.
Calculate MoS for your specific formulation with the MoS Calculator.
EU CosIng Annex Listing
European Commission CosIng database Annex references per Regulation (EC) No 1223/2009.
Annex IV — Permitted Colorants
Product type: Yellow
Expanded Jurisdictional Detail
Additional regulatory detail beyond the 7-jurisdiction summary: Saudi SFDA, Korea MFDS, ASEAN ACD, Japan/Korea, Brazil/India, and cross-jurisdictional restriction entries.
SA Saudi SFDA (IV - Colorants)
Product type: Rinse-off products.
BRIN Brazil/India Cosmetics
India: Permitted Colorant
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Dye
Expert Verdict
Expert safety assessment and concern-level summary for CI 18820.
Regulatory Flags
azo-dye
eu-permitted
rinse-off-only
fda-delisted
banned-in-us
pyrazolone-dye
synthetic-colorant
Known Synonyms
Acid Yellow 11
Benzenesulfonic acid, 4-[4,5-dihydro-3-methyl-5-oxo-4-(2-phenyldiazenyl)-1H-pyrazol-1-yl]-, sodium salt (1:1)
Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, sodium salt
4-(3-hydroxy-5-methyl-4-phenylazopyrazol-2-yl)benzenesulphonate
EINECS 228-808-0
C.I. Acid Yellow 11, sodium salt
Acid Brilliant Yellow G
UNII-ED6O1DCO98
Acid Yellow 11, sodium salt
Chemical Function
Dye
Regulatory Lists
inert_ingredient; non_food_use; Pesticides
Australian Status
AICIS status: listed
Frequently Asked Questions
Is CI 18820 allowed in the EU?
CI 18820 EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does CI 18820 do in cosmetics?
CI 18820 functions as: Colorant. It is classified as a cosmetic ingredient in our database. CAS number: 6359-82-6.
Is CI 18820 used outside cosmetics?
CI 18820 also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Compliance Tools
Check CI 18820 compliance across multiple jurisdictions:
Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
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