Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information


The substance is a salt and completely dissociates in water; it is in its ionic form within environmentally relevant pH values.

Key value for chemical safety assessment

Additional information

The substance is a salt; the dye part is cationic (pyridinium rings and protonated tertiary amines) and the counter ions are chloride ions (derived from HCl).

Based on the high water solubility, the substance is assumed to be completely dissociated in water. Moreover, within environmentally relevant pH values, i.e. in the range 4-9, the substance is present in its ionic form, based on the molecular structure and pKa values of tertiary amines, typically > 9.5 -10.