What does it mean that the four stone heads of a Chinese painting tree are divided into three light crimson colors?

Branches should be left and right. For 4 branches. The stone is divided into three sides, that is to say, the stone has two sides, yin and yang, and the top surface, which is simply a three-dimensional sense. Pale crimson coloring refers to the uniform use of color, not eating pen marks, generally using ochre and azurite. Don't make it colorful, use color on a large scale. Or use less color. Pay attention to the overall effect. These are traditional techniques that can be appreciated by looking at ancient works.