Here are some keys points from the handout, for your reference, from How to Draw and Paint by Henry Gasser:
A. The three primary colors, yellow, red, and blue, mixed together neutralize each other to make a gray.
B. The three secondary colors, orange, violet, and green, mixed together neutralize each other to make a gray.
C. Two primary colors, in this case yellow and red, mixed together make a secondary color (orange).
D. Two primary colors, in this case blue and yellow,mixed together make a secondary color (green).
E. A primary color (yellow) mixed with a secondary color (green) makes an intermediate hue (yellow-green).
F. Two primary colors, in this case red and blue, mixed together make a secondary color (violet).
G. Two colors opposite each other on the color wheel (complementary colors) mixed together neutralize each other to make a gray. In this case yellow and violet were mixed to produce a gray.
H. When black is mixed with a color, it grays the color to produce a neutralized hue. In this case black was added to red to make a neutralized red.
I. When a neutralized color is mixed with a color, it grays the color to produce a neutralized hue. In this case a deep brown was added to blue to make a neutralized blue.
J. Here is another neutralized color mixed with a color to produce a neutralized hue. In this case a reddish brown was added to violet to make a neutralized violet.
Have a look at the following graphic, courtesy of M. Grumbacher, Inc.:
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