Secondly, spot colors are not formulated to be halftone screened. As a result the pigment grind can cause poor ink transfer, mottling, and other issues. (sometimes it works though)
Gordo, a slightly related subject, we print all our book covers with a pms background that is a vignette which starts fading from 100% about 1/2 way up the page and goes to about 50% at the top of the cover. We have experienced problems getting this vignette to print smooth and I'm thinking could it be because we switched from 150 screen to 175 nearly 2 years ago now. We print one series with a dark purple pms #5255 and that ink is always wearing out the front edge of our plates on longer runs, we run other pms inks without this problem but they are usually shorter runs. Someone had suggested we have that color ground finer similar to what you've just described, is that a possibility you think?
Do you think we could go back to 150 for the pms vignette only and get by with it? We do have a small 1/4" wide band at 15% of this pms that crosses over the scenery photos on our front covers which we've always just run at the same angle as black at 45. See attachment...Any suggestions?
Thanks
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