Nine Colors

Quick answer：

The concept of 'nine colors' can refer to various cultural or artistic contexts. In traditional Chinese painting, there is a concept of 'the nine colors of the brush' which includes black, white, red, blue, green, yellow, purple, brown, and pink. These colors are used to create a wide range of hues and shades. In a broader sense, it could also refer to any grouping of nine colors, such as in the RGB color model, which uses red, green, and blue to mix all other colors.