Disclosed is a method of dyeing keratin fibres, in particular hair, which involves:a) achieving the desired colour by mixing two or three compositions, each of which includes a single direct dye, magenta, blue or yellow, having similar performance characteristicsb) adding the mixture obtained at step a) to a diluent composition；c) mixing and applying the composition obtained at step b) to the hair, optionally after checking the resulting colour by comparing it with reference standards.
