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InventoryRef 3162313/08/2020

ACID RED 18

Trisodium 1-(1-naphthylazo)-2-hydroxynaphthalene-4',6,8-trisulphonate (CI 16255)

ACID RED 18 is linked to 2 EU annex records on this page. Inventory note: III/192 (Acid Red 18; Acid Red 18 Aluminum Lake) IV/35 (CI 16255).

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Restricted entry found
Open this evidence		2English and EU languages
Great BritainSource mapped
Official source mapped; ingredient rule not imported
0English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandSource mapped
Official source mapped; ingredient rule not imported
0English
ASEANSource mapped
Official source mapped; ingredient rule not imported
0English and national languages
ChinaSource mapped
Official source mapped; ingredient rule not imported
0Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaSource mapped
Official source mapped; ingredient rule not imported
0Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilSource mapped
Official source mapped; ingredient rule not imported
0Portuguese with INCI crosswalks
IndiaSource mapped
Official source mapped; ingredient rule not imported
0English and Hindi
Saudi ArabiaSource mapped
Official source mapped; ingredient rule not imported
0Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 2611-82-7
CAS 2611-82-7PubChem CID 17466

C.I. Acid Red 18, trisodium salt

IUPAC name
trisodium;7-hydroxy-8-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1,3-disulfonate
Molecular formula
C20H11N2Na3O10S3
Molecular weight
604.5 g/mol
Exact mass
603.92689092 Da
Topological polar surface area
242.0 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
12
Covalent units
4
Defined stereocentres
0

Also known as

RefChem:1080550Ponceau 4RNew coccineAcid red 18C.I. Acid Red 18Food Red No. 102Victoria Scarlet 3RSX Purple
16 more reported names
Brilliant Scarlet 4RCoccineColacid Ponceau 4RFood Red 7Acilan Scarlet V3RAcid Brilliant Scarlet 3RCerticol Ponceau 4RSCochineal Red AAtul Acid Scarlet 3RFood Red 102Food Red Number 102C.I. Acid Red 28Edicol Supra Ponceau 4RSNeucoccinBrilliant Ponceau 3RBrilliant Scarlet 3R
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for ACID RED 18

INCI name

ACID RED 18

Description

Trisodium 1-(1-naphthylazo)-2-hydroxynaphthalene-4',6,8-trisulphonate (CI 16255)

Record provenance

Inventory reference
31623
Imported identity
ACID RED 18
Source update
13/08/2020
European Commission CosIng source notes
Annex III Restriction reference
Entry 192

ACID RED 18

CAS: 2611-82-7 - 12227-64-4
EC: 220-036-2 - 235-438-3
Annex IV Restriction reference
Entry 35

CI 16255

CAS: 2611-82-7
EC: 220-036-2

Key data

CAS
2611-82-7
EC
220-036-2
Restriction
III/192 (Acid Red 18; Acid Red 18 Aluminum Lake) IV/35 (CI 16255)
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.

#862 · ACID RED 18

Records sharing a CAS or EC identity

CI 16255

Ingredients with overlapping formulation functions

ACID ORANGE 24HAIR DYEING
ACID ORANGE 3HAIR DYEING
ACID ORANGE 6HAIR DYEING
ACID ORANGE 7HAIR DYEING
ACID RED 18 ALUMINUM LAKEHAIR DYEING
ACID RED 184HAIR DYEING
ACID RED 27HAIR DYEING
ACID RED 27 ALUMINUM LAKEHAIR 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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How ACID RED 18 appears in the CosIng inventory

The CosIng inventory lists ACID RED 18 as a cosmetic ingredient and this page links it to 2 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

ACID RED 18 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 18 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 18 reads: "III/192 (Acid Red 18; Acid Red 18 Aluminum Lake) IV/35 (CI 16255)". 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 18 carries the following function designation(s):

CAS 2611-82-7 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 18

This page combines the CosIng inventory entry for ACID RED 18 with 2 linked Annex II–VI records from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research ACID RED 18 and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

View sourcesView updates

Tools & next steps

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