What are the three primary colors?

The color of the 3-degree background color of hair dyeing is actually a color close to the natural black color of our hair, such as brown black, dark brown, dark brown and blue black. These are the colors of the 3 degree background color. The color of hair is always divided into numbers. The smaller the color, the darker the color. The larger the number, the lighter the color. Different numbers represent different speeds. The color below 5 degrees is natural and healthy, 6 to 7 degrees is moderately obvious, and 8 degrees.