The other technique, a little more complicated, consists of mixing the primary colors (Cyan, Magenta, Yellow) to find the desired shade.
The advantage is that you only need 3 paints, but the disadvantage is that it is much more difficult to find the color. Simply because it is very difficult to have a paint that corresponds 100% to the primary color.
Use our color wheel for this technique to know in what proportions to mix the colors.