(1) The same type of dye should be used for color matching to facilitate the control of the dyeing process and the simplification of the process.
(2) Dyeing properties of dyes such as directness, dyeing rate, and color fastness should be similar to facilitate the control of color light, otherwise the color will be different after dyeing, and the color will be different due to different degrees of fading during post-processing or use. Change.
(3) The number of dyes for color matching should be as small as possible to facilitate the control of color light.
(4) Master the principle of residual color, which means that the two colors have mutual elimination characteristics.