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CAS 1 record

CAS 4857-81-2

CAS 4857-81-2 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 4857-81-2
CAS 4857-81-2PubChem CID 25021982

Acid Green 9

IUPAC name
sodium 3-[[4-[(2-chlorophenyl)-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]methyl]-N-ethylanilino]methyl]benzenesulfonate
Molecular formula
C37H34ClN2NaO6S2
Molecular weight
725.2 g/mol
Exact mass
724.1444511 Da
Topological polar surface area
137.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
7
Covalent units
2
Defined stereocentres
0

Also known as

Indigo Green BErio greenMilling GreenErio Viridine BC.I. Acid Green 9Airedale Green BFenazo Green XGFolan Green B
16 more reported names
Kiton Green BNight Green AAcid Brilliant Green 6BMerantine Green BLeather Green 6BDisulphine Green BNeptune Green SGXABucacid Fast Green BHidacid Fast Green BXylene Fast Green 6BAmacid Milling Green BBrilliant Acid Green BAcid Leather Green KGBBrilliant Acid Green 6BXylene Milling Green 6BBrilliant Milling Green B
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.

Records for CAS 4857-81-2

1 total
Annex
IV
Entry
64

CI 42100

Hydrogen [4-[(2-chlorophenyl)[4-[ethyl(3-sulphonatobenzyl)amino]phenyl]methylene]cyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium, sodium salt
EC
225-458-0
Max concentration

How CAS 4857-81-2 is used on this site

CAS 4857-81-2 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 4857-81-2 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 4857-81-2 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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