What does the restriction note for ACID RED 73 mean?

The restriction field for ACID RED 73 reads: II/1233. This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

What other records share CAS 5413-75-2?

CAS 5413-75-2 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains ACID RED 73?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 4171215/10/2010

ACID RED 73

1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,disodium salt (CI 27290)

ACID RED 73 is linked to 1 EU annex record on this page. Inventory note: II/1233.

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Regulatory evidence by market

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Market	Evidence status	Records	Source language
European Union	Evidence linked Prohibited entry found Open this evidence	1	English and EU languages
Great Britain	Source mapped Official source mapped; ingredient rule not imported	0	English
Canada	Source mapped Official source mapped; ingredient rule not imported	0	English and French
New Zealand	Source mapped Official source mapped; ingredient rule not imported	0	English
ASEAN	Source mapped Official source mapped; ingredient rule not imported	0	English and national languages
China	Source mapped Official source mapped; ingredient rule not imported	0	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Source mapped Official source mapped; ingredient rule not imported	0	Korean with some English names
United States	Source mapped Official source mapped; ingredient rule not imported	0	English
Australia	Source mapped Official source mapped; ingredient rule not imported	0	English
Brazil	Source mapped Official source mapped; ingredient rule not imported	0	Portuguese with INCI crosswalks
India	Source mapped Official source mapped; ingredient rule not imported	0	English and Hindi
Saudi Arabia	Source mapped Official source mapped; ingredient rule not imported	0	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 5413-75-2

CAS 5413-75-2PubChem CID 21519

1,3-naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, disodium salt

Woodstain scarlet is an organic sodium salt that is the disodium salt of 7-hydroxy-8-{[4-(phenyldiazenyl)phenyl]diazenyl}naphthalene-1,3-disulfonic acid. Occasionally used for the demonstration of muscle fibres in conjunction with, or as a replacement for, acid fuchsin. It has a role as a histological dye. It contains a 7-hydroxy-8-{[4-(phenyldiazenyl)phenyl]diazenyl}naphthalene-1,3-disulfonate. — ChEBI

IUPAC name: disodium;7-hydroxy-8-[(4-phenyldiazenylphenyl)diazenyl]naphthalene-1,3-disulfonate

Molecular formula: C22H14N4Na2O7S2
Molecular weight: 556.5 g/mol
Exact mass: 556.00992971 Da
Topological polar surface area: 201.0 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 11
Covalent units: 3
Defined stereocentres: 0

Also known as

Sodium 6-hydroxy-5-(4-phenylazophenylazo)naphthalene-2,4-disulphonate1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-, disodium saltRefChem:4153691,3-Naphthalenedisulfonic acid, 7-hydroxy-8-4-(phenylazo)phenylazo-, disodium saltACID RED 73Brilliant croceinWoodstain ScarletC.I. Acid Red 73

16 more reported names

Crocein Scarlet MOOCrocein Scarlet 3BBrilliant Crocein MOOC.I. Acid Red 73, disodium saltBrilliant Croceine MOOC.I. 272905PLA82FV3CCI 272907-Hydroxy-8-((4-(phenylazo)phenyl)azo)-1,3-naphthalenedisulfonic acid, disodium salt1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-(2-(4-(2-phenyldiazenyl)phenyl)diazenyl)-, sodium salt (1:2)1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[2-[4-(2-phenyldiazenyl)phenyl]diazenyl]-, sodium salt (1:2)NSC-7832NSC-47724UNII-5PLA82FV3CBrilliant Scarlet R (VAN)Brilliantcroceine

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:87189
EPA DTXSID:DTXSID1041712

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

Inventory details for ACID RED 73

INCI name

ACID RED 73

Description

1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-[[4-(phenylazo)phenyl]azo]-,disodium salt (CI 27290)

Record provenance

Inventory reference: 41712
Imported identity: ACID RED 73
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for ACID RED 73

Annex II Restriction reference

Entry 1233

Acid Red 73 (CI 27290), when used as a substance in hair dye products

CAS: 5413-75-2

EC: 226-502-1

Key data

CAS

5413-75-2

—

Restriction

II/1233

Function

HAIR DYEING: Imparting color to hair. Hair dyeing preparations may be temporary, semi-permanent, or permanent, depending on the length of time the colorant remains on the hair.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#872 · ACID RED 73

Records sharing a CAS or EC identity

CI 27290

Ingredients with overlapping formulation functions

ACID RED 33HAIR DYEING

ACID RED 35HAIR DYEING

ACID RED 51COLORANT, HAIR DYEING

ACID RED 52HAIR DYEING

ACID RED 87COLORANT, HAIR DYEING

ACID RED 92HAIR DYEING

ACID RED 95HAIR DYEING

ACID VIOLET 43HAIR DYEING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How ACID RED 73 appears in the CosIng inventory

The CosIng inventory lists ACID RED 73 as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

ACID RED 73 is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

ACID RED 73 appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for ACID RED 73 reads: "II/1233". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, ACID RED 73 carries the following function designation(s):

HAIR DYEING

CAS 5413-75-2 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for ACID RED 73

This page combines the CosIng inventory entry for ACID RED 73 with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research ACID RED 73 and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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