As for adjusting black, it is best to adjust black directly. The adjusted black will not be pure black, there will be some gray, which is basically high-grade gray. Purple is generally the ratio of red to blue.
If you want to change a color and add some discoloration, the color will become brighter.
The matching skills of propylene pigment and gouache pigment are very similar. For students who can't match gouache colors or have poor matching foundation, it is recommended to use 83 colors in the Ailong pigment-free series, which are composed of 22 solid colors and 6 1 high-grade ash. Still life and interlining can be drawn casually, saving time and points, which is very easy to use.