Why is there a color difference between proofs and formal proofs?

Because the proofer "target="_blank"> proofer is a dry printing method, the color is dry when the secondary color is overprinted, and the quality of the paper and ink used by the proof is better than the official printing, so the color is brighter. This is due to the slow speed of the proofer, the rapid operation during the official printing and the wet overprinting, and the fact that the wetting fluid must always maintain the correct pH for the best print quality.