Chemical Database

2,7-Naphthalenedisulfonic acid, 4-amino-3-((4'-((2,4-diaminophenyl) azo) (1,1'-biphenyl)-4-yl) azo)-5-hydroxy-6-(phenylazo)-, disodium salt


  • CAS Number: 1937-37-7
  • Synonyms/Related:
    • 2,7-Naphthalenedisulfonic acid, 4-amino-3-((4'-((2,4-diaminophenyl) azo) (1,1'-biphenyl)-4-yl) azo)-5-hydroxy-6-(phenylazo)-, disodium salt
    • 2,7-Naphthalenedisulfonic acid, 4-amino-3-((4'-((2,4-diaminophenyl) azo) (1,1'-biphenyl)-4-yl) azo)-5-hydroxy-6-(phenylazo)-, disodium salt
    • 2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4'-[ (2,4-diaminophenyl) azo][1, 1'-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)-, disodium salt
    • 4-Amino-3-((4'-((2,4-diaminophenyl) azo)-4- biphenylyl) azo)-5-hydroxy-6-(phenylazo)-2,7- naphthalenedisulfonic acid, disodium salt
    • Ahco Direct Black GX
    • Airedale Black ED
    • Aizen Direct Deep Black EH
    • Aizen Direct Deep Black GH
    • Aizen Direct Deep Black RH
    • Amanil Black GL
    • Amanil Black WD
    • Apomine Black GK
    • Apomine Black GX
    • Atlantic Black BD
    • Atlantic Black C
    • Atlantic Black E
    • Atlantic Black EA
    • Atlantic Black GAC
    • Atlantic Black GG
    • Atlantic Black GXCW
    • Atlantic Black GXOO
    • Atlantic Black SD
    • ATul Direct Black E
    • Azine Deep Black EW
    • Azocard Black EW
    • Azomine Black EWO
    • Belamine Black GX
    • Bencidal Black E
    • Benzamil Black E
    • Benzanil Black E
    • Benzo Deep Black E
    • Benzo Leather Black E
    • Benzoform Black BCN-CF
    • Black 2EMBL
    • Black 4EMBL
    • Brasilamina Black GN
    • Brilliant Chrome Leather Black H
    • Calcomine Black
    • Calcomine Black EXL
    • Carbide Black E
    • CERN prima 38 [Czech]
    • Chloramine Black C
    • Chloramine Black EC
    • Chloramine Black ERT
    • Chloramine Black EX
    • Chloramine Black EXR
    • Chloramine Black XO
    • Chloramine Carbon Black S
    • Chloramine Carbon Black SJ
    • Chloramine Carbon Black SN
    • Chlorazol black
    • Chlorazol Black E
    • Chlorazol Black E (Biological Stain)
    • Chlorazol Black EA
    • Chlorazol Black EN
    • Chlorazol Burl Black E
    • Chlorazol Leather Black ENP
    • Chlorazol Silk Black G
    • Chrome Leather Black E
    • Chrome Leather Black EC
    • Chrome Leather Black EM
    • Chrome Leather Black G
    • Chrome Leather Brilliant Black ER
    • Coir Deep Black C
    • Columbia Black EP
    • Columbus Black EP
    • Coranil Direct Black F
    • Diacotton Deep Black
    • Diacotton Deep Black RX
    • Diamine Deep Black EC
    • Diamine Direct Black E
    • Diaphtamine Black V
    • Diazine Black E
    • Diazine Direct Black E
    • Diazine Direct Black G
    • Diazol Black 2V
    • Diphenyl Deep Black G
    • Direct Black 3
    • Direct Black 38
    • Direct Black 38 (technical grade)
    • Direct Black 38, technical-grade [Benzidine-based dyes]
    • Direct Black A
    • Direct Black BRN
    • Direct Black CX
    • Direct Black CXR
    • Direct Black E
    • Direct Black EW
    • Direct Black EX
    • Direct Black FR
    • Direct Black GAC
    • Direct Black GW
    • Direct Black GX
    • Direct Black GXR
    • Direct Black JET
    • Direct Black Meta
    • Direct Black methyl
    • Direct Black N
    • Direct Black Ndirect Black RX
    • Direct Black RX
    • Direct Black SD
    • Direct Black WS
    • Direct Black Z
    • Direct Deep Black E
    • Direct Deep Black E Extra
    • Direct Deep Black EA-CF
    • Direct Deep Black EAC
    • Direct Deep Black EW
    • Direct Deep Black EX
    • Disodium 4-amino-3-((4'-((2,4-diaminophenyl) azo) (1,1'-biphenyl)-4-azo))-5-hydroxy-6-(phenylazo) naphthalene-2,7-disulphonate
    • Disodium 4-amino-3-((4'-((2,4-diaminophenyl) azo) (1,1'-biphenyl)-4-yl) azo)-5-hydroxy-6-(phenylazo) naphthalene-2,7-disulphonate
    • EM 38
    • Enianil Black CN
    • Erie Black B
    • Erie Black BF
    • Erie Black GAC
    • Erie Black GXOO
    • Erie Black JET
    • Erie Black NUG
    • Erie Black RXOO
    • Erie Brilliant Black S
    • Erie Fibre Black VP
    • Fenamin Black E
    • Fibre Black VF
    • Fixanol Black E
    • Formaline Black C
    • Formic Black C
    • Formic Black CW
    • Formic Black EA
    • Formic Black MTG
    • Formic Black TG
    • Hispamin Black EF
    • Interchem Direct Black Z
    • Kayaku Direct Deep Black EX
    • Kayaku Direct Deep Black GX
    • Kayaku Direct Deep Black S
    • Kayaku Direct Leather Black EX
    • Kayaku Direct Special Black AAX
    • Lurazol Black BA
    • Meta Black
    • Mitsui Direct Black EX
    • Mitsui Direct Black GX
    • Nippon Deep Black
    • Nippon Deep Black GX
    • Paper Black BA
    • Paper Black T
    • Paper Deep Black C
    • Paramine Black B
    • Paramine Black E
    • Peeramine Black E
    • Peeramine Black GXOO
    • Phenamine Black BCN-CF
    • Phenamine Black CL
    • Phenamine Black E
    • Phenamine Black E 200
    • Phenamine Black E200
    • Pheno Black EP
    • Pheno Black SGN
    • Pontamine Black E
    • Pontamine Black EBN
    • Sandopel Black EX
    • Seristan Black B
    • Telon Fast Black E
    • Tertrodirect Black E
    • Tertrodirect Black EFD
    • Tetrazo Deep Black G
    • Union Black EM
    • Vondacel Black N


  • Boiling Point: K °C °F
  • Flammability:
    • Explosive Limits:
      • Lower Explosive Limit: 0%
      • Upper Explosive Limit: 0%
    • Flammable Limits:
      • Lower Flammable Limit: 0%
      • Upper Flammable Limit: 0%
    • Flash Point K °C °F
    • Autoignition Temperature: K °C °F
  • Melting Point: K °C °F

Related Resources

  • USDOT Hazardous Materials Table 49 CFR 172.101
    An online version of the USDOT's listing of hazardous materials from 49CFR 172.101. This table can be sorted by proper shipping name, UN/NA ID and/or by primary hazard class/division.
  • 2008 ERG (Emergency Response Guidebook)
    Have you ever wondered what those four digit numbers on the placards on the side of trucks and rail cars mean? Our online 2008 ERG will give you your answer. This is an online version of the guidebook produced by the USDOT for first responders during the initial phase of a Dangerous goods/HazMat incident. ERG data last verified/updated Oct. 2, 2011
  • US DOT Hazardous Materials Transportation Placards
    Hazardous materials placards (DOT placards) are required when shipping hazardous materials in the United States, Canada and Mexico. These pages provide US DOT definitions for each hazmat placard.
  • Guide for Handling Household Chemicals
    Things you can do to make your home safer.
  • Molarity, Molality and Normality
    Introduces stoichiometry and explains the differences between molarity, molality and normality.
  • Molar Mass Calculations and Javascript Calculator
    Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
  • Periodic Table of Elements
    Provides comprehensive data for each element of the periodic table of elements including up to 40 properties, names in 10 languages and common chemical compounds. Information also provided for 3,600 nuclides and 4,400 nuclide decay modes.

Editor's note: Some chemicals in this database contain more information than others due to the original reason this information was collected and how the compilation was accomplished.

While working with material safety data sheets (MSDS), I found that manufacturers sometimes used obscure names for constituent chemicals and I didn't always have a good idea of what I was dealing with. To resolve this problem, over the years, I compiled chemical names and identifiers into a personal database, cross referencing regulatory and health safety information when possible. Colleagues and friends eventually started suggesting that I make my data available on this website so that others could benefit from my efforts -- which I finally did in 2004. The more common, regulated and/or hazardous a chemical is, the more information I will have likely collected it.


If you are aware of any synonyms listed above that are registered trademarks, please contact us with relevant information so that trademarks can be appropriately noted.

Notes about mixtures

Some chemicals listed in this database or not pure chemical compounds, rather they are mixtures/solutions of chemicals. It is not uncommon for wide range of molar ratios of a mixture to be lumped together as "synonyms" of the same "chemical". In some instances chemicals that are very similar from a health & safety and/or regulatory standpoint also may have been lumped together.

Reference Sources

Data for this database was compiled from: hundreds of Material Safety Data Sheets (MSDS) of common industrial and household products; the Hazardous Materials Table from the United States "Code of Federal Regulations" title 49 section 172.101; the National Institute for Occupational Safety and Health Pocket Guide to Chemical Hazards; the US DOT 1996, 2000 & 2004 Emergency Response Guidebooks; U.S. National Library of Medicine and many other related resources.


WARNING: These pages are for general reference and educational purposes only and MUST NOT be relied upon as a sole source to determine regulatory compliance or where matters of life and health are concerned. This site and the author do not warrant or guarantee the accuracy or the sufficiency of the information provided and do not assume any responsibility for its use.

To ensure regulatory compliance when transporting hazardous materials or dangerous goods, one must receive proper training and certification from a qualified instructor and refer to the current year's Code of Federal Regulations Title 49 (49CFR) or your country's shipping regulations. In matters regarding workplace safety, refer to current OSHA regulations (29CFR) and NIOSH guidelines or your own country's health and safety regulations. No one should ever enter into a hazardous environment without proper training from qualified instructors.

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