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CAS 1 record

CAS 81-77-6

CAS 81-77-6 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 81-77-6
CAS 81-77-6PubChem CID 6690

C.I. Pigment Blue 60

Vat blue 4 appears as blue needles with a metallic luster or fine fluffy deep blue powder. (NTP, 1992) — CAMEO Chemicals

IUPAC name
2,17-diazaheptacyclo[16.12.0.03,16.04,13.06,11.019,28.021,26]triaconta-1(18),3(16),4(13),6,8,10,14,19(28),21,23,25,29-dodecaene-5,12,20,27-tetrone
Molecular formula
C28H14N2O4
Molecular weight
442.4 g/mol
Exact mass
442.09535693 Da
XLogP3
4.9
Topological polar surface area
92.3 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
6
Covalent units
1
Defined stereocentres
0

Also known as

IndanthroneIndanthreneVat blue 4Medium BlueIndanthren BlueIndanthrene BlueCarbanthrene Blue RSCaledon Blue RN
16 more reported names
Palanthrene Blue GPTPonsol RPPonsol Blue GZCelliton Blue RNLutetia Fast Blue RSVat Blue OFood Blue 4Mikethrene Blue RSN6,15-Dihydroanthrazine-5,9,14,18-tetroneIndanthrene Blue RSNNihonthrene Blue RSNPonsol Blue RCLPonsol Blue RPCGraphtol Blue RLParadone Blue RSTinon Blue RS
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 81-77-6

1 total

How CAS 81-77-6 is used on this site

CAS 81-77-6 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 81-77-6 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 81-77-6 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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