On the Post-cure Case (UV Inks)

Also, Smith relates, numerous tiny holes of non-coverage sometimes appear with rough or porous substrates. Because the press operator may perceive the problem as being a color issue rather than one of coverage, he might apply more ink, resulting in an overly thick film layer.

Finally, pinholing can also occur through poor flame treatment and/or contamination of the ink. As with porous substrates, these pinholes can be microscopic and mistakenly diagnosed as a color deficiency.