C.I. ACID ORANGE 7

PRODUCT IDENTIFICATION

 
CAS NO. 633-96-5

ORANGE II 

EINECS NO. 211-199-0
FORMULA HOC10H6N=NC6H4SO3Na
MOL WT. 350.32
H.S. CODE 3204.12.5090
TOXICITY  
SYNONYMS C.I. Acid Orange 7; C.I. 15510;

D & C Orange No.4; Mandarin G; Orange(II), certified; Orange P; Orange R; Tropaeolin No2; Acid Orange A; Orange II;

4-[(2-Hydroxy-1-naphthyl)azo]benzenesulfonic acid monosodium salt; 4-(2-Hydroxynaphthylazo)benzenesulfonic acid sodium salt; 1-p-Sulfophenylazo-2-naphthol, monosodium salt; p-((2-Hydroxy-1-naphthyl)azo)benzenesulfonic acid sodium salt; Other RN: 161628-32-6, 75025-97-7, 84842-86-4
SMILES

c12c(\N=N\c3ccc(S(=O)(=O)[O-])cc3)c(ccc1cccc2)O.[Na+]

CLASSIFICATION

Acid Dye, Stain,

EXTRA NOTES

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE Yellow Powder
MELTING POINT 164 C
BOILING POINT  
SPECIFIC GRAVITY  
SOLUBILITY IN WATER Soluble (116 g/l)
SOLUBILITY

 

FASTNESS Light (3-4), Washing (4), Rubbing Wet (4-5), Rubbing·Dry (3-4)
AUTOIGNITION  
pH  
VAPOR DENSITY  
NFPA RATINGS Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

  
FLASH POINT

 

STABILITY Stable under ordinary conditions

EXTERNAL LINKS & GENERAL DESCRIPTION

Wikipedia Linking - Acid_orange 7

Google Scholar Search - C.I. Acid Orange 7

Drug Information Portal (U.S. National Library of Medicine) - C.I. Acid Orange 7

PubChem Compound Summary - C.I. Acid Orange 7

KEGG (Kyoto Encyclopedia of Genes and Genomes) - C.I. Acid Orange 7

http://www.ebi.ac.uk/ - C.I. Acid Orange 7

http://www.ncbi.nlm.nih.gov/ - C.I. Acid Orange 7

http://toxnet.nlm.nih.gov/
Hazardous Substances Data Bank - C.I. Acid Orange 7

Local:
Acid dyes are water-soluble dyes employed mostly in the form of sodium salts of the sulfonic or carboxylic acids. They are anionic which attach strongly to cationic groups in the fibre directly. They can be applicable to all kind of natural fibres like wool, cotton and silk as well as to synthetics like polyesters, acrylic and rayon. But they are not substantive to cellulosic fibres. They are also used in paints, inks, plastics and leather. Orange acid azo dyes produce an orange-pink color. They are used in coloring foods and drugs and as intermediates for making photosensive dyes and drugs. They are used  as counter stains in histology and cytology and as components of Mallory's acid fuchsin. C.I. Acid Orange 7 (acid magenta) is a various mixture of sulfonated fuchsins. There are four of these compounds which have three sulfonic groups each. It is used in Andrade's indicator and in various complex stains to demonstrate collagen fibres red and in smooth muscle in contrast to collagen. It is used as a pH indicator.

Examples of orange acid dyes

  • Ethyl orange Sodium salt ( CAS RN: 62758-12-7)
  • Orange II ( CAS RN: 633-96-5)
  • Orange III (methyl orange, CAS RN: 547-58-0)
  • Orange IV  (CAS RN: 554-73-4)
  • Orange G ( CAS RN: 1936-15-8)
  • Tropaeolin O (CAS RN: 547-57-9)
  • Victoria orange
  • Acid Orange II (Dibromofluorescein, 596-03-2)
SALES SPECIFICATION

APPEARANCE

 Yellow Powder
STRENGTH

100.0 ± 3.0%

MOISTURE

5.0% max

INSOLUBLES IN WATER

1.0% max

TRANSPORTATION
PACKING  
HAZARD CLASS Not regulated
UN NO.

 

SAFETY INFORMATION

HAZARD OVERVIEW

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

GHS

 

SIGNAL WORD Warning

PICTOGRAMS

HAZARD STATEMENTS

H315-H319-H335

P STATEMENTS

P261-P305 + P351 + P338

EC DIRECTIVES

 

HAZARD CODES

RISK PHRASES

36/37/38

SAFETY PHRASES

26




BIOLOGICAL STAINS, INDICATORS