Print marks
I am attaching some pictures generally explaining where in the process of printing the marks are from and why they are there. The demonstration pictures have cigar labels but the process was the same.
Essentially there was a sticking up sheet that each color transfer was aligned to, once aligned the marks were then removed then the sheet as a whole was transferred to the production plate. The Mullin card below shows that the registration marks from the pink color transfer was not removed or fully removed and then printed. In theory there should be other Mullin cards with the same pink registration mark from the same press run.
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