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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Environmental fate & pathways


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Link to relevant study record(s)

Description of key information

T1/2 to equilibrium of 2.1 hours.

Key value for chemical safety assessment

Additional information

A 45% decrease in initial Malachite Green (MG) concentration was observed in 145 hours under dark conditions, showing that an important part of MG degradation is due to hydrolysis (Perez et al, 2007). The pK of MG is reported to be 6.89 (Goldacre et al, 1949) with a T1/2 to equilibrium of 2.1 hours. The hydrolysis reaction is the transformation of MG into its Carbinol derivative.