You may find something interesting in a fairly lengthy thread here on the LB forum where I use a little 2.3W Banggood diode laser and the NWT method on ceramic tiles… and then extend it to transparent window glass. Along the way I “discovered” a “no-paint” technique using cereal-box cardboard (chipboard?) as a backing… with comparable results to using black paint (tempera or spray). I also demo a method to create two-step “two-color/tone” glass engravings, differing only in the paint used for each step…
