We are currently working in Adobe Illustrator CS6 and are having an issue in separations where the ai file has no black in it only spot colors. A separated pdf is created from a Post Script file. The PDF does not view with a black in it, but when printed a black is showing up in the printouts as an additional separation. We worked around this issue by using different settings in distiller but it came back up as an issue through the Nexus rip. There are no known effects in the area affected, and is not viewable in the adobe software. We're stumped on what is causing the issue.
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