Ways to find the color matching of furniture paint

Color matching is a knowledge, and manual color matching needs to know more about the inevitability of color matching/what kind of wood paint is it first? Water or mixed white paint? The basis of color matching is to master the depth of the target color, if the target color contains pigments of three primary colors' red, yellow and blue'; Does not contain black; Relatively simple, grasp the depth by analogy and adding color; Just like my friend mentioned above, purple-according to the preparation scheme of furniture and wood paint, the raw materials must be mixed with white; However, the pigment must be the oil or primary color paint used in wood paint, that is to say, the manual preparation method of purple mixed water wood paint = mixed white+red (oil/primary color paint)+blue (oil/primary color paint); The ratio of white+red+blue pigment is 2: 1: 1, so chestnuts are brown, but I don't know what pigment my friend uses. Here is a brief talk about the manual deployment method: red+yellow+black = brown system.