Recently got a UV laser, and have been enjoying marking a few different types of fabric, some more successful than others.
The one that has proven to be the trickiest, however, is black nylon and polyester, which all come out practically imperceptible at most viewing angles:
Does anyone have experience with laser marking on these kinds of fabrics? I suspect there may be a heat-reactive additive of some kind I could use, but have no idea where to start