Foreign particles are adhering to the plate or blanket.
- Check for contamination in ink and/or fountain solution and rollers for deterioration.
- Use scotch tape to remove hickey for examination. If pigment or ink skin, remove old ink from fountain and replenish with ink from a freshly opened can.
- If paper ﬁbers, try a different run of paper, or if necessary, gradually reduce the tack of ink.