08/28/2026
Following up on yesterday's post about dark vs light garments, here's a deeper look at the underbase and why it matters so much.
An underbase is a layer of white ink printed first, before any colors go down. On dark fabric, it creates a bright, opaque foundation that the color inks sit on top of. Without it, you're printing color on color (or color on black), and the result is always duller than expected.
After the white underbase is printed, it gets flash cured, which means it passes under a heat source just long enough to firm up without fully curing. Then the color layers go on top, and everything cures together at the end.
The thickness and opacity of that underbase directly affects how vibrant the final colors look. A thin or rushed underbase means colors that look faded straight out of the dryer. Getting it right takes experience and attention at the press, but it's the difference between a shirt that looks like the proof and one that falls short.