Pretreatment Marks

Pretreatment marks are the faint rectangle, discoloration, or slight sheen that sometimes shows up around a fresh DTG print, left by the pretreatment fluid sprayed onto the garment in an area a bit larger than the final print before ink ever hits the shirt. When that spray isn't perfectly even, or the treated zone extends slightly past the printed design, the edge of the rectangle can read as a subtle cast once the fluid cures under heat — most visible on dark, heavyweight 100% cotton under angled or bright light.

We tell every buyer the same thing the first time they hold a fresh dark-shirt DTG print up to a window: that faint border is completely normal, not a flaw in the printing. It's residual polymer from a necessary step in the process, and it fades or disappears entirely after the first wash as the residue rinses out in the machine.

Shops reduce visible pretreatment marks by matching the spray pattern precisely to the print area and using a calibrated auto-spray machine instead of a hand pump, and by choosing formulas built to dry clear rather than leaving a visible cast. Tight-knit, combed cotton generally shows the marks less than looser, higher-pile blanks, since the fluid sits more evenly on a smoother surface.

The mistake we see most is a buyer spotting that rectangle on a brand-new shirt and assuming it's defective or asking for a reprint. It's process residue from a necessary step in dark-garment DTG printing, and one trip through the wash is normally all it takes to clear it.