Substance Information

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Substance Infocard


1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-((4'-((2-hydroxy-1-naphthalenyl)azo)-(1,1'-biph

EC / List no.: 613-540-2

CAS no.: 6426-67-1

Mol. Formula:

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Key datasets

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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
CAD - Chemical Agents Directive
  • CAD - Chemical Agents Directive, Annex III - Prohibitions
    EU. Directive 98/24/EC, Annex III, Prohibitions, OJ (L 131) 11, 5 May 1998

    This list contains substances assigned a binding OEL by the EU. National OELs for these substances may not deviate from the limits in the directive. Annex III contains a list of prohibited substances and their concentration limit values in percent by weight.

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Substance names and other identifiers

Regulatory process names
1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-((4'-((2-hydroxy-1-naphthalenyl)azo)-(1,1'-biph
1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-((4'-((2-hydroxy-1-naphthalenyl)azo)-(1,1'-biphenyl)-4-yl)-azo)-, trisodium salt
1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-[[4'-[(2-hydroxy-1-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-, trisodium salt
Pre-Registration process
1,3,6-Naphthalenetrisulfonic acid, 8-hydroxy-7-[[][[]4'-[[](2-hydroxy-1-naphthalenyl)azo][[]1,1'-biphenyl]-4-yl]azo]-, trisodium salt
C.I. Direct Violet 22, trisodium salt
Other names
C.I. Direct Violet 22
Pre-Registration process
Other identifiers
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:

Name EC / List no. CAS no. Association
Benzidine and its salts - - Expert judgement

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