ANTHRAQUINONE BLUE

Description

BLUE RSN · CAS 81-77-6 · C28H14N2O4. UNII R68OT0N83K. Other Experimental Properties: DECOMPOSES @ 470-500 °C.

Identification

CAS Registry Number	81-77-6
PubChem CID	6690
Molecular formula	C28H14N2O4
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
UNII (FDA)	R68OT0N83K

Computed Descriptors

Molecular Weight	442.4
XLogP3	4.9
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	0
Exact Mass	442.09535693
Monoisotopic Mass	442.09535693
Topological Polar Surface Area	92.3
Heavy Atom Count	34
Formal Charge	0

Physical & Chemical Properties

Other Experimental Properties	DECOMPOSES @ 470-500 °C

Physical description & handling notes

• Vat blue 4 appears as blue needles with a metallic luster or fine fluffy deep blue powder. (NTP, 1992)
• Liquid; Dry Powder; CBI
• Blue solid; [Merck Index]
• BLUE POWDER
• BLUE NEEDLES
• 878 to 932 °F (decomposes) (NTP, 1992)

Regulatory Status

Regulatory & Food Contact	COLOUR: Food Additives CI VAT BLUE 4 NO ADI ALLOCATED Previous temporary ADI withdrawn NMRS 54/TRS 557-JECFA 18/17 FAS 6/NMRS 54A-JECFA 18/93
GHS notification summary	73.1% (201 / 275)

GHS Hazard Classification

GHS notification summary	73.1% (201 / 275)
Reported hazard statements	H412 (13.5%), H413 (13.1%)

Documented Uses

• Used to dye unmordanted cotton and as pigment in quality paints and enamels; Indanthrene Blues used in automotive paints, plastics, rubber, and printing inks; [HSDB]
• Painting (Pigments, Binders, and Biocides) [Category: Paint]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• DYEING UNMORDANTED COTTON; PIGMENT IN QUALITY PAINTS & ENAMELS
• Plastics -> Typical concentration range in plastic materials -> 2%
• Food Additives -> COLOUR -> JECFA Functional Classes

Synonyms

Indanthrone; 81-77-6; Indanthrene; Vat blue 4; Medium Blue; Indanthren Blue; Indanthrene Blue; Carbanthrene Blue RS; Caledon Blue RN; Palanthrene Blue GPT; Ponsol RP; Ponsol Blue GZ; Celliton Blue RN; Lutetia Fast Blue RS; Vat Blue O; Food Blue 4

Frequently Asked Questions

What are the CAS number and molecular formula of BLUE RSN?

CAS 81-77-6; molecular formula C28H14N2O4; molecular weight — g/mol.

What other names is BLUE RSN known by?

Indanthrone, 81-77-6, Indanthrene, Vat blue 4, Medium Blue, Indanthren Blue.

What is the regulatory status of BLUE RSN?

Documented regulatory listings: COLOUR: Food Additives; CI VAT BLUE 4; NO ADI ALLOCATED.

Is BLUE RSN classified as hazardous?

73.1% of GHS notifications report no hazard classification (201 of 275).

What are the key physical properties of BLUE RSN?

Other Experimental Properties: DECOMPOSES @ 470-500 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.