Why does CAS 2784-89-6 appear in more than one EU cosmetic annex?

A substance identified by CAS 2784-89-6 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 2784-89-6?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 2784-89-6 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 2784-89-6

Q: How do I use CAS 2784-89-6 for compliance screening?

Cross-reference CAS 2784-89-6 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 2784-89-6 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 2784-89-6

CAS 2784-89-6PubChem CID 5464602

4-Amino-2-nitrodiphenylamine

On the basis of the animal and clinical data included in this report, the CIR Expert Panel concludes that HC Red No. 1 is safe as used in hair dye formulations at concentrations of ≤ 0.5%. The CIR Expert Panel re-affirmed the above conclusion June 2011. — Cosmetic Ingredient Review (CIR)

IUPAC name: 2-nitro-1-N-phenylbenzene-1,4-diamine

Molecular formula: C12H11N3O2
Molecular weight: 229.23 g/mol
Exact mass: 229.085126602 Da
XLogP3: 3.0
Topological polar surface area: 83.9 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

2-Nitro-4-aminodiphenylamine1,4-Benzenediamine, 2-nitro-N1-phenyl-HC Red no. 12-Nitro-N-phenylbenzene-1,4-diamine2-Nitro-N1-phenyl-1,4-benzenediamineEINECS 220-494-31FZM1701IS2-nitro-4-amino-n-phenylaniline

15 more reported names

2-Nitro-N(sup 1)-phenyl-1,4-benzenediaminep-Phenylenediamine, 2-nitro-N(sup 1)-phenyl-2-Nitro-N'-phenyl-1,4-benzenediamine1,4-Benzenediamine, 2-nitro-N(sup 1)-phenyl-1-ANILINO-4-AMINO-2-NITROBENZENEP-PHENYLENEDIAMINE, 2-NITRO-N1-PHENYL-RefChem:517692HC RED NO. 1 [INCI]2-nitro-N1-phenylbenzene-1,4-diamineUNII-1FZM1701IS2-nitro-N1-phenyl-benzene-1,4-diamineWHJNKCNHEVCICH-UHFFFAOYSA-NDS-08562-Nitro-N~1~-phenylbenzene-1,4-diamineCS-0156101

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External database identifiers

EPA DTXSID:DTXSID4062640

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 2784-89-6

1 total

Annex

III

Entry

258

HC Red No 1

2-Nitro-N1-phenyl-benzene-1,4- diamine

Hair colorants can cause severe allergic reactions.

220-494-3

Max concentration

How CAS 2784-89-6 is used on this site

CAS 2784-89-6 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 2784-89-6 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 2784-89-6 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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