Flash cure.

A short burst of heat applied between print strokes that sets the top of a wet ink layer so the next color can go over it without pulling ink back into the screen. The target is a gelled skin: dry enough that the print does not lift on your finger, still soft enough that the layer above bonds into it instead of sitting on a hardened shell. Over-flashing is the common miss, and it shows up as colors that will not stick to the underbase, scorched fabric, or dye pulled out of a polyester blank; the setting also drifts through a run as the pallets themselves heat up. By the time the adhesion failure is visible on a finished shirt, the press has already run more of the job at that setting, and those pieces are scrap too.