We are talking about characterizing our presses to become certified to be a G7 master printer. I was wondering about the ISO 12647-2 ink LAB values. What is the tolerance for these CMYK inks and if you don’t use ISO certified inks, can you still be certified as a master G7 printer?. Our pressman like Van Son ink and don’t want to change.
The LAB values of these inks are close to ISO 12647, but how close do they have to be. I found a article that says the “variation” deltaE is a 5 on CMYK and a “fluctuation” deltaE is a 4. These seem pretty wide tolerances.