Work and turn inks set too quickly

Consult ink manufacturer for more stable, slower drying ink

Dark color inks are printed on first and second units

Adjust ink sequence

Poor layout sequence: solid is over- printed by another solid or screen tint

Adjust layout and/or sequence to print lighter cover forms before heavier

Improper tack sequence

Use tack-graded inks, printing highest tack inks first; use properly formulated uniform tack inks

Ink dries during long make-readies

Clean press to shorten make-ready times

Excessive solvent evaporation due to press speed

Reduce press speed and use fresh ink

Substrate (usually glossy) susceptible to back trapping

Consult paper manufacturer; change substrate

Press design; the greater the distance from the first to last printing unit, the greater the potential for mottle

Consult paper manufacturer; change substrate