11, color difference
The color difference has the same print color difference (left and right color difference and up and down color difference), the same batch of color difference and the color difference between batches. Chromatic aberration in the same batch is the color error between the prints, which is also caused by uneven ink volume adjustment.
The difference between batches due to changes in materials, it is inevitable that there will be color.
Solution: Correctly adjust the amount of ink so that the color difference of the same print, the color difference of the same batch, and the color difference between batches are within the allowable color difference range of the customer.