A defect where ink fails to lay down in a smooth, continuous film, resulting in a patchy or mottled appearance on the substrate. This usually happens in large solid areas and is caused by poor ink transfer, improper roller pressure, or contaminated paper surfaces that resist the ink.
Heard on the job
The blue solid on the back cover is looking scabby, so check your form rollers and bump up the ink feed.
Insider tip
Scabby prints often mean the ink is too tacky for the paper stock, causing it to pull unevenly rather than flowing flat.