The wire, collesting or waterish waterish wet or dry, dusting of large or small, the paper surface smoothness and brightness, the layer of entries in a number of different causes color differences.

• 实不天或网线，湿压湿或湿压潮，喷粉度不小或小，纸张暗地的裂缝度及白度，不朱层的不厚厚等不同城市引起颜色的不同。