A process is described for the level di- and trichromatic dyeing of polyacrylonitrile materials or of blends containing polyacrylonitrile, which process comprises using for the dyeing an aqueous dyeing liquor which contains at least two dye mixtures, each dye mixture consisting of at least (a) one migrating cationic dye, the cation weight of which is less than 310, the parachor of which is less than 750 and the log P of which is less than 3.6, and (b) at least one non-migrating cationic dye, at least one parameter of which is outside the definition given under (a), and the components (a) and (b) being employed in a mixing ratio which is such that during the dyeing process the migrating and non-migrating dyes migrate on the fibre on tone. This produces, on polyacrylonitrile materials, dyeings which are distinguished by high levelness and high lightfastness.
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