Chemical Database

1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-hydroxy-1-naphthylazo)-, sodium salt


  • CAS Number: 2538-85-4
  • Synonyms/Related:
    • 1-Naphthalenesulfonic acid, 3-hydroxy-4-((2-hydroxy-1-naphthalenyl) azo)-, monosodium salt
    • 1-Naphthalenesulfonic acid, 3-hydroxy-4-((2-hydroxy-1-naphthalenyl) azo)-, zinc salt (2:1)
    • 1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-hydroxy-1-naphthylazo)-, sodium salt
    • 1-Naphthalenesulfonic acid, 3-hydroxy-4-[ (2-hydroxy-1-naphthalenyl) azo]-, monosodium salt
    • 1-Naphthalenesulfonic acid, 3-hydroxy-4-[ (2-hydroxy-1-naphthalenyl) azo]-, zinc salt (2:1)
    • 2,2'-Dihydroxyazonaphthalene-4-sulfonic acid, zinc salt
    • 2,2'-Oxy-4-sulfononaphthaleneazonaphthalene
    • 3-Hydroxy-4-((2-hydroxy-1-naphthalenyl) azo)-1-naphthalenesulfonic
    • 3-Hydroxy-4-((2-hydroxy-1-naphthalenyl) azo)-1-naphthalenesulfonic acid, monozinc salt
    • 3-Hydroxy-4-((2-hydroxynaphthyl) azo) naphthalene-1-sulphonic acid
    • 3-Hydroxy-4-(2-hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid,
    • 3-Hydroxy-4-(2-hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid, sodium salt
    • 3-Hydroxy-4-[(2-hydroxy-1-naphthalenyl) azo]-1-naphthalenesulfonic acid, monozinc salt
    • 3-Hydroxy-4-[(7-hydroxynaphthyl) diazenyl]naphthalenesulfonic acid, sodium salt
    • Acid Chrome Blue
    • Acid Chrome Blue Black
    • Acid Chrome Dark Blue ERN
    • Alizarine Blue Black R
    • Alizarine Blue OCR
    • Alizarine Blue OCRA
    • Alizarine Blue OCRB
    • Alizarine Blue OCRN
    • Alizarine Blue OS
    • Alizarine Chrome Black 6B
    • Anthranol Chrome Blue Black RBA
    • Anthranol Chrome Blue Black RZF
    • Atlantichrome Blue Black RZN
    • Azochromol Blue Black R
    • Calcochrome Blue Black R
    • Calcon
    • Chromazine Blue Black R
    • Chrome Acid Blue
    • Chrome Black 6B
    • Chrome Blue Black 2B
    • Chrome Blue Black BSS
    • Chrome Blue Black R
    • Chrome Blue Black RC
    • Chrome Blue Black RF
    • Chrome Blue Black RW
    • Chrome Fast Blue M
    • Chrome Fast Cyanine 2BSS
    • Chrome Fast Cyanine BN
    • Chrome Fast Cyanine BNZ
    • Chrome Fast Cyanine BSS
    • Chrome Fast Cyanine GR
    • Chromocard Blue Black R
    • Cromal Blue Black R
    • Diacromo Blue B
    • Diamond Blue Black RBA High Conc. CF
    • Diamond Blue Black RW
    • Diamond Blue Black RZF Super Special
    • Diamond Fast Blue E
    • Durochrome Blue OCRA Ex
    • Durochrome Blue OCRN
    • Erio Chrome Blue Black R
    • Erio Chrome Blue Black RS Soluble
    • Erio Chrome Blue Black RS Supra
    • Erio Chrome Blue Black RZ
    • Eriochrome Blue Black 2RCS
    • Eriochrome Blue Black MR
    • Eriochrome Blue Black R
    • Eriochrome Blue Black RC
    • Eriochrome Blue Black RCS
    • Eriochrome Blue Black RSS
    • Fast Chrome Cyanine 2B
    • Fast Chrome Cyanine 2B New
    • Fast Chrome Cyanine 2BS
    • Fast Chrome Cyanine 3B
    • Fenakrom Blue Black R
    • Fenakrom Blue Black RZF
    • Hispacrom Blue B
    • Java Chrome Blue Black RN
    • Kayaku Chrome Blue Black R
    • Kenachrome Dark Blue B
    • Lighthouse Chrome Dark Blue B
    • Magracrom Blue
    • Mitsui Chrome Blue Black RC
    • Mordant Black 17
    • NCI60_003954
    • NCI60_004126
    • Omega Chrome Blue Black R
    • Omega Chrome Blue Black RSS
    • Omega Chrome Blue Black RZN
    • Palatine Chrome Black 6BN
    • Pontachrome Black B
    • Pontachrome Blue Black R
    • Pontachrome Blue Black RM
    • Pontachrome Blue Black ZF
    • Salicine Chrome Blue Black RW
    • Sodium 3-hydroxy-4-(2-hydroxy-1-naphthylazo)-1-naphthalenesulphonate
    • Solochrome Dark Blue
    • Solochrome Dark Blue B
    • Solochrome Dark Blue BN
    • Sunchromine Blue Black R
    • Superchrome Blue B
    • Superchrome Blue BCM
    • Superchrome Blue Black Extra
    • Superchrome Blue BS
    • Superchrome Blue BZ
    • Superchrome Blue RBN
    • Superchrome Blue ZF
    • Superchrome Blue ZFAM
    • Symulon Chrome Blue Black RC
    • Telon Chrome Navy Blue R
    • Tertrochrome Blue Black RW
    • Tertrochrome Blue R
    • Yodochrome Blue Black FZ
    • Zinc 2,2'-dihydroxy-1,1'-azonaphthalene-4-sulphonate


  • 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.

Citing this page

If you need to cite this page, you can copy this text: