Why does CAS 23920-15-2 appear in more than one EU cosmetic annex?

A substance identified by CAS 23920-15-2 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts — for example, restricted under Annex III with specific conditions, while also appearing in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

How do I check if my formula contains a substance with CAS 23920-15-2?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 23920-15-2 to screen it directly, then review every linked annex record and supplier document.

CAS 2 records

CAS 23920-15-2

Q: How do I use CAS 23920-15-2 for compliance screening?

Cross-reference CAS 23920-15-2 against your raw material specification sheets and CoA documents. When it appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met. All annex entries sharing this CAS number are listed on this page.

CAS 23920-15-2 matches 2 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 23920-15-2

CAS 23920-15-2PubChem CID 71587861

HC Blue 11

IUPAC name: 2-[N-(2-hydroxyethyl)-4-(2-methoxyethylamino)-3-nitroanilino]ethanol;hydrochloride

Molecular formula: C13H22ClN3O5
Molecular weight: 335.78 g/mol
Exact mass: 335.1247985 Da
Topological polar surface area: 111.0 Å²
Hydrogen-bond donors: 4
Hydrogen-bond acceptors: 7
Covalent units: 2
Defined stereocentres: 0

Also known as

HC Blue no. 11Colorex HCB11UNII-83ZYM95HPE83ZYM95HPEEthanol, 2,2'-((4-((2-methoxyethyl)amino)-3-nitrophenyl)imino)bis-, monohydrochlorideRefChem:145364HC BLUE NO. 11 [INCI]459-980-7

2 more reported names

Ethanol, 2,2'-[[4-[(2-methoxyethyl)imino]-3-nitrophenyl]amino]bis-, hydrochloride (1:1)2,2'-({4-[(2-Methoxyethyl)amino]-3-nitrophenyl}azanediyl)di(ethan-1-ol)--hydrogen chloride (1/1)

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID30238394

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

Records for CAS 23920-15-2

2 total

Annex

III

Entry

196

HC BLUE NO. 11

1-[(2'-Methoxyethyl)amino]-2-nitro-4-[di-(2'-hydroxyethyl)amino]benzene (see note 17)

- Do not use with nitrosating systems - Maximum nitrosamine content: 50 microgram/kg - Keep in nitrite-free containers

459-980-7

Max concentration

Annex

III

Entry

220

HC Blue No 11

1-[(2′-Methoxye thyl)amino]-2-nitro- 4-[di-(2′-hydroxye thyl)amino]ben zene

— Do not use with nitro sating agents — Maximum nitrosamine content: 50 μg /kg — Keep in nitrite-free containers

459-980-7

Max concentration

How CAS 23920-15-2 is used on this site

CAS 23920-15-2 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 2 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 23920-15-2 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.

Frequently asked questions

A substance identified by CAS 23920-15-2 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.

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Tools & next steps

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