Acid black 2

Description

Acid black 2 · CAS 8005-03-6 · C22H14N6Na2O9S2. UNII SZT789770M.

Identification

CAS Registry Number	8005-03-6
PubChem CID	135442942
Molecular formula	C22H14N6Na2O9S2
IUPAC name	disodium;4-amino-5-hydroxy-3-[(4-nitrophenyl)diazenyl]-6-phenyldiazenylnaphthalene-2,7-disulfonate
UNII (FDA)	SZT789770M

Computed Descriptors

Molecular Weight	616.5
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	14
Rotatable Bond Count	4
Exact Mass	616.00590696
Monoisotopic Mass	616.00590696
Topological Polar Surface Area	273
Heavy Atom Count	41
Formal Charge	0
Complexity	1110

Physical description & handling notes

• A group of dark blue or black dyes; [Hawley] Black powder; [MSDSonline] There are water-soluble, ethanol-soluble, and fat-soluble nigrosines; [Ullmann]
• SOME SOL IN WATER, ALC, OIL /NIGROSINES/

Regulatory Status

Regulatory & Food Contact	CIR / INCI: Hair dyeing; Cosmetic colorant
GHS notification summary	100% (3 / 3)

GHS Hazard Classification

GHS notification summary	100% (3 / 3)

Documented Uses

• Azine dye; [Kirk-Othmer] Used to make inks and shoe-polish and for dyeing leather, wood, textiles, and plastics; [HSDB] Made from the reaction of nitrobenzene on aniline in the presence of iron(II) chloride; The crude mixture of nigrosine hydrochlorides (Phenol Black L) is used to dye phenolic resins; Bases are used to make printing colors and to dye plastics; [Ullmann]
• Leather Tanning and Processing [Category: Industry]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• SHARK REPELLENT /NIGROSINE DERIV/
• IN MANUFACTURE OF INK, SHOE-POLISH; IN DYEING LEATHER, WOOD, TEXTILES, PLASTICS
• IN SOAP, ANODIZED ALUMINUM, PAPER /SULFATED NIGROSINES/

Synonyms

83006-55-7; 4-Amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt; RefChem:446195; DTXSID101085622; 280-105-8; ACID BLACK 1; 1064-48-8; Naphthol Blue Black; Amido Black 10B; Acid black 2; 8005-03-6; Buffalo Black NBR; C.I. Acid Black 1; NIGROSINE; Amidoschwarz; Amido black

Frequently Asked Questions

What are the CAS number and molecular formula of Acid black 2?

CAS 8005-03-6; molecular formula C22H14N6Na2O9S2; molecular weight — g/mol.

What other names is Acid black 2 known by?

83006-55-7, 4-Amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt, RefChem:446195, DTXSID101085622, 280-105-8, ACID BLACK 1.

What is the regulatory status of Acid black 2?

Documented regulatory listings: CIR / INCI: Hair dyeing; Cosmetic colorant.

Is Acid black 2 classified as hazardous?

100% of GHS notifications report no hazard classification (3 of 3).

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.