First of all, color is the product of the visual system after receiving light stimulation, and it is the subjective image of the individual to the light stimulation of different wavelengths in the visible spectrum. As like as two peas, the color deviation is not the same as in the printing process. The deviation is due to the deep knowledge of the Shifu. The source of printing color difference is mainly caused by improper human operation, so the master should have a thorough understanding of the formation of color.

那么在印刷过程中出现颜色差别该如何处理呢？我们要注意三个要求：

So how to deal with the color difference in the printing process? We should pay attention to three requirements:

1、 对原纸的要求：对每批原纸进行严格的检验，检验指标包括厚度、挺度、定量、水分、颜色、表面张力、转移膜粘接牢度、镭射图案等，逐一与技术标准的一概不用，这样就避免了因原纸有色差等问题。

1. Requirements for base paper: each batch of base paper shall be strictly inspected, and the inspection indexes include thickness, stiffness, ration, moisture, color, surface tension, transfer film bonding fastness, laser pattern, etc., which are not used in accordance with the technical standards one by one, so as to avoid problems such as color difference of base paper.

2、 对油墨的要求：要求油墨供应商对标样印刷所用油墨进行定量分析，主要包括油墨的强度、灰度、色相误差、着色力、透明度、粘度、细度、颜色稳定性等指标，以此作为油墨的技术标准。油墨供应商所供每批油墨需提供详细、真实的指标检测数据，并与标准油墨指标比对，符合各项内控指标时才能投入使用，这样就能有效避免以往凭主观判定油墨适用性，没有对油墨进行定量分析而造成的印刷色差。

2. Requirements for ink: the ink supplier is required to conduct quantitative analysis on the ink used in standard sample printing, mainly including the ink strength, gray scale, hue error, coloring power, transparency, viscosity, fineness, color stability and other indicators, which are used as the technical standard of ink. Each batch of ink supplied by the ink supplier needs to provide detailed and real index test data, and compare with the standard ink index. Only when it meets the internal control index can it be put into use. In this way, it can effectively avoid the printing color difference caused by subjective judgment of ink applicability and no quantitative analysis of ink.

3、 注重对印刷设备的检修调整：定期对墨槽进行彻底清洗，确保墨匙动作灵活到位。查看水辊、墨辊、摆驾有无磨损现象。用塞规、印制墨杠等方法检验印刷压力，使之与预设值保持一致。测量橡皮布及印版厚度，使之与标准数据相符。及时更换达到使用寿命的UV灯，避免因UV灯功率衰减而影响油墨固化速度，而影响印刷质量。及时更换达到规定印数的印版，避免因图案的细微磨损而影响印刷颜色效果等。

3. Pay attention to the maintenance and adjustment of printing equipment: clean the ink tank thoroughly on a regular basis to ensure that the ink key moves flexibly and in place. Check whether the water roller, ink roller and swing drive are worn. Check the printing pressure with plug gauge and printing ink bar to make it consistent with the preset value. Measure the thickness of blanket and plate to make it consistent with the standard data. Timely replacement of UV lamp to achieve service life, avoid UV lamp power attenuation and affect the ink curing speed, and affect the printing quality. Timely replacement of the plate to achieve the required number of prints, to avoid the impact of the printing color effect due to the slight wear of the pattern.

要想处理好颜色差别，就要做好以上三点，正确认识产生印刷色差的若干因素所在，通过把好印刷工艺和操作技术关，不但可以有效地避免这样和那样的印刷弊病产生，而且可以较好地保证彩色印刷品的墨色质量，印刷出完美的产品，赢得客户的信任。

In order to deal with the color difference, we must do the above three points well, correctly understand the factors that cause the printing color difference. By controlling the printing process and operation technology, we can not only effectively avoid this and that kind of printing defects, but also better ensure the ink quality of color printing products, print perfect products, and win the trust of customers.