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[6] The dye can also be prepared by the condensation of formaldehyde and dimethylaniline to give a leuco dye: [3] [4] [7] CH 2 O + 3 C 6 H 5 N(CH 3) 2 → CH(C 6 H 4 N(CH 3) 2) 3 + H 2 O. Second, this colourless compound is oxidized to the coloured cationic form (hereafter with oxygen, but a typical oxidizing agent is manganese dioxide, MnO 2):