To provide a color-dying technique that can dye a material to be dyed in several colors simultaneously.

In the dyeing process according to this invention, (1) a material to be dyed, e.g. a fabric, is partially soaked in the solution of dyer's saffron including carthamin and safflower yellow, (2) the material to be dyed having knots is soaked in the dye bath or (3) the material to be dyed having wrinkles is soaked in the dye bath, then the dyed material is irradiated with microwaves or (4) a weight is loaded on the material dyed with the solution and the dyed product is irradiated with microwaves under the loading.