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In accordance with column 2 of REACH Annexes VII, VIII and IX, there is no need to investigate the aquatic toxicity of the substance. Indeed, barium hexaferrite is highly insoluble in water; moreover, considering its physicochemical properties, the substance exists only in crystalline form as solid substance and, due to its high density, it is expected to be simply deposited. Therefore direct and indirect exposure of the aquatic compartment is unlikely.