The UK Government’s Veterinary Medicines Directorate have found traces of malachite green in salmon at Morrisons stores. The chemical, originally a dye for cotton, was historically used as a fungus and parasite irradicator.
The dye was banned from fish farms in June 2002 after US scientists showed the dye caused genetic mutations.
The EU recently threatened the UK with a ban on exported salmon because of chemical residues in farmed fish.