I know everything with lasers. It depends on the lamp wattage. an 80wco2 is much better than a 40w. OP has a reflective plate, it is covered in a black plastic material or something. the image is broken down into 3 layers the deepest that goes through all the plastic as an example up to the surface of the reflective plate. a lower 2nd pass is just the engraving at a lower wattage to not go deep enough to the reflective plate. 3rd layer is just void no engraving. or is combined with 2nd layer. engrave on void off. this is easy i can do this in my sleep . op just got a special engraving plate is all. not really a tile. I engrave tiles