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Annex III Entry 190 12/08/2020

ACID BLUE 9

Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl-[(3-sulfophenyl)-methyl]-amino]-phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo, inner salts, disodium salt and its ammonium and aluminium salts (15); Acid Blue Acid Blue 9 Ammonium salt; CI 42090. (see note 17)

ACID BLUE 9 is listed in Annex III and may only be used under the conditions shown in this record. Maximum concentration in this record: 0.5%.

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Restricted substance— Annex III, EU Regulation 1223/2009
Max conc.: 0.5%
Entry: 190

Chemical identity and properties

PubChem 2D chemical structure for CAS 2650-18-2
CAS 2650-18-2PubChem CID 17559

C.I. Acid Blue 9

Erioglaucine A is an aromatic amine. — ChEBI

IUPAC name
diazanium;2-[[4-[ethyl-[(3-sulfonatophenyl)methyl]amino]phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]benzenesulfonate
Molecular formula
C37H42N4O9S3
Molecular weight
783.0 g/mol
Exact mass
782.21139245 Da
Topological polar surface area
205.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
10
Covalent units
3
Defined stereocentres
0

Also known as

Erioglaucine AAlphazurine FGErioglaucineErioglaucine EJapan Blue 205Alphazurine FGNDNeptune Blue WFFenazo Blue XR
16 more reported names
Patent Blue AECalcocid Blue EGKiton Blue ARXylene Blue VSGNeptune Blue BRAPatent Blue 2YCalcocid Blue 2GTortrazine C extraWater Blue 9Bucacid Azure BlueHidacid Azure BlueAcid Blue AE-SFBleu Brilliant FCFBrilliant Blue LakeKiton Pure Blue LPro-Jet Blue OAM
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 3844-45-9
CAS 3844-45-9PubChem CID 19700

FD&C Blue No. 1

Brilliant Blue is an organic molecular entity. — ChEBI

IUPAC name
disodium;2-[[4-[ethyl-[(3-sulfonatophenyl)methyl]amino]phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]benzenesulfonate
Molecular formula
C37H34N2Na2O9S3
Molecular weight
792.9 g/mol
Exact mass
792.12218275 Da
Topological polar surface area
203.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
10
Covalent units
3
Defined stereocentres
0

Also known as

Brilliant Blue FCFBrilliant BlueBlue 1206FD & C Blue no. 1Fenazo Blue XIJapan Blue 1Merantine Blue EGCosmetic Blue Lake
16 more reported names
Hexacol Brilliant Blue ABrilliant Blue FCF supraJapan Blue No. 1Intracid Pure Blue LUsacert Blue No. 1FDC Blue No. 1Food Blue Dye No. 1Modr Kysela 9Aizen Food Blue No. 2Modr Brilantni FCFblue no. 1C.I. ACID BLUE 9, DISODIUM SALTCanacert Brilliant Blue FCFModr Potravinarska 2Usacert FD and C Blue No. 1D&C Blue No. 1
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Maximum concentration

0.5%

Product type

Hair dye substance in non-oxidative hair dye products

INCI glossary name

ACID BLUE 9

Chemical name

Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl-[(3-sulfophenyl)-methyl]-amino]-phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo, inner salts, disodium salt and its ammonium and aluminium salts (15); Acid Blue Acid Blue 9 Ammonium salt; CI 42090. (see note 17)

Chemical / IUPAC name

Benzenemethanaminium, N-ethyl-N-[4-[[4-[ethyl-[(3-sulfophenyl)-methyl]-amino]-phenyl](2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfo, inner salts, disodium salt and its ammonium and aluminium salts (15); Acid Blue Acid Blue 9 Ammonium salt; CI 42090.

Regulatory information

Regulation

(EC) 2013/344

See every entry this act set

SCCS opinions

Identified ingredients

Key data

CAS
3844-45-9 - 2650-18-2 - 68921-42-6
EC
223-339-8 - 220-168-0 - 272-939-6
Annex
III
Entry number
190

Inventory links for ACID BLUE 9

Inventory Restriction reference
Ref 31613

ACID BLUE 9

CAS: 3844-45-9
EC: 223-339-8
Inventory Restriction reference
Ref 32756

CI 42090

CAS: 3844-45-9
EC: 223-339-8
Annex III 191
Shared product type

CURRY RED

CAS: 25956-17-6
EC: 247-368-0
Annex III 192
Shared product type

ACID RED 18

CAS: 2611-82-7 - 12227-64-4
EC: 220-036-2 - 235-438-3
Annex III 193
Shared product type

ACID RED 52

CAS: 3520-42-1
EC: 222-529-8
Annex III 195
Shared product type

ACID BLUE 62

CAS: 4368-56-3
EC: 224-460-9
Annex III 204
Shared product type

DIHYDROXYINDOLINE

CAS: 29539-03-5 - 138937-28-7
EC: - - 421-170-6

What Annex III means for ACID BLUE 9

ACID BLUE 9 is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 4 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Ensure formulation concentration does not exceed: 0.5%
  • Confirm product type compatibility: Hair dye substance in non-oxidative hair dye products
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

ACID BLUE 9 is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 3844-45-9 - 2650-18-2 - 68921-42-6 is the unique numerical identifier assigned to ACID BLUE 9 by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

The maximum concentration of 0.5% applies to the concentration of the substance in the ready-to-use cosmetic product. When the substance is supplied as part of a blend or mixture, the calculation must account for the contribution of all sources in the formulation. The combined concentration must not exceed the stated limit.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
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Source note for Annex III record ACID BLUE 9

This page summarizes one Annex III record for ACID BLUE 9 from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for ACID BLUE 9, but confirm any final regulatory decision against the current official annex wording and source files.

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