The present application relates to a method for dyeing keratin fibres, in particular human keratin fibres such as hair, comprising a step of applying, to said keratin fibres, one or more 7-amino-1,2,3,4-tetrahydroquinoline derivatives, substituted in position 8; dye compositions comprising such 7-amino-1,2,3,4-tetrahydroquinolines; and devices for implementing these compounds.