How to draw nine tones of purity

Enter the software purity nine tones, then take the three primary colors first, and finally color through the three primary colors. Starting from the color scale, the color scale has eleven grades from the blackest to the whitest, and each of the eleven grades is basically a tone, which is divided into high-key, medium-key and low-key. Brightness at 0-3 degrees is low-key, 4-6 degrees is medium-key, and 7- 10 degrees is high-key.