According to chromatology theoy igniarius jonbang and color to all of the overprint colors out of quadrochromatic, including color and gray (also known as a non-color) two series.

• 根据色彩学理论，黄、品、青三色即可叠印出原稿的全部色彩，其中包括彩色和灰色（也称非彩色）两大系列。