1, two intermediate colors are mixed, but the ratio is not equal, which is called compound color.

For example, green+orange+purple+green.

2. The colors formed by primary colors and halftone are not equal in proportion, which is called composite color. For example, red+green yellow+purple blue+orange.

3. Add different proportions of red, yellow and blue.

In short, a composite color must have three primary colors: red, yellow and blue.

Red+orange is not a composite color, because orange is only red and yellow, and red is only orange, which is red and orange.