Avoid Dye Migration

Dye migration usually shows up after the job is gone, not at the dryer. A shop can print hundreds of polyester garments with poly white, see perfect results, ship them, then get photos days later of pink or brown graphics bleeding through black fabric. 

Overdyed or mystery garments are the highest risk, especially contract jobs where you did not source the blanks. 

Heat is the accelerant, not just in the dryer but trapped inside stacked shirts and totes. A tall hot stack becomes a heat chamber that keeps activating dye long after printing ends. That same trapped heat can even damage packaging or start fires in extreme cases. 

Polyester runs should be laid flat and spaced out to cool before stacking, not piled immediately. Build cooling time into production the same way you build flash time or cure time. If you must stack, keep stacks small and let them breathe between layers. 

Controlling post-dryer heat is one of the simplest ways to prevent post-bleed disasters and six-figure reprint mistakes.