Substance Information

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REACH Registration data can be found in the new ECHA CHEM database. The old ‘Registered substance factsheets’ will be available on this web site during the transition period but have not been updated since 19 May 2023. More


Substance Infocard


2- Naphthalenesulfonic acid, 5,5'-[[1,1'-biphenyl]-4,4'-diylbis(2,1-diazenediyl)]bis[6- amino-4-hydroxy-, sodium salt (1:2)

EC / List no.: 607-822-4

CAS no.: 2586-60-9

Mol. Formula:

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Key datasets


Regulatory context

Here you can find all of the regulations and regulatory lists in which this substance appears, according to the data available to ECHA. This substance has been found in the following regulatory activities (directly, or inheriting the regulatory context of a parent substance):

REACH - Registration, Evaluation, Authorisation and Restriction of Chemicals Regulation
  • Substances predicted as likely to meet criteria for category 1A or 1B carcinogenicity, mutagenicity, or reproductive toxicity, or with dispersive or diffuse use(s) where predicted likely to meet any classification criterion for health or environmental hazards, or where there is a nanoform soluble in biological and environmental media.
  • Substances indicated, in 2009, as being intended to be registered by at least one company in the EEA.
PIC - Prior Informed Consent Regulation
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Substance names and other identifiers

Regulatory process names
2- Naphthalenesulfonic acid, 5,5'-[[1,1'-biphenyl]-4,4'-diylbis(2,1-diazenediyl)]bis[6- amino-4-hydroxy-, sodium salt (1:2)
PIC, Other
2-Naphthalenesulfonic acid, 5,5'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(6-amino-4-hydroxy-, disodium salt
2-Naphthalenesulfonic acid, 5,5'-[[1,1'-biphenyl]-4,4'-diylbis(2,1-diazenediyl)]bis[6-amino-4-hydroxy-, sodium salt (1:2)
Pre-Registration process
Other names
C.I. Direct Violet 1
Pre-Registration process
Other identifiers
PIC, Pre-Registration process, Other
CAS number
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Group parents

This substance has been identified as member of the following groups of substances:

Results list is empty
Name EC / List no. CAS no. Association
[No public or meaningful name is available] - - Official source
Benzidine, its salts and benzidine derivatives - - Expert judgement (ECHA)