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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Data used to evaluate the physical and chemical properties are on different salt forms of Malachite Green (MG): read across between chloride, oxalate and acetate salt forms of MG present the same main component and have a different counter ion that doesn't influence the characteristics related to the specific end-point.

Malachite Green Acetate (MGA) is a green solid crystal with a metallic lustre, more often used in liquid form. DSC test recorded a melting point at 140 °C and a reaction of decomposition at 165 °C, thus it decomposes before boiling (R&C, 2016).

Particle size distribution showed that MGA is characterized by particle too large to pass in bronchi and lungs (R&C, 2016).

The affinity of MGA with the n-octanol phase is low, demonstrated by LogKow of 0.9 (R&C, 2016)

MGA is very soluble in water and the dissociation constant (pKa) showed that MG is 100% ionised at pH 4.0, 50 % at pH 6.9, 25 % at 7.4 and 0 % at pH 10.1

MG does not ignite and propagate combustion; no chemical groups associated with oxidising properties are present in the molecule. Explosiveness test shows that substance has no impact sensitivity and an exothermic reaction occurs with onset at 153°C. Regarding dust explosive risk, it only occurs in concentrations (100 g/m³) which are not relevant for handling in the dye facilities; these concentrations are only relevant for spray drying.

MGA does not meet the criteria to be considered as flammable/explosive/oxidising.