[Frankie] and [Bryan] have figured out a way to use the laser to chemically activate an etching process. See experiment part 2 as well. First, to be clear, they are using a quality 40W Epilog Zing ...

[Dan Royer] explains a simple method to engrave/etch on both sides of a material ... You begin by taping down your work piece on the laser bed. Draw a symmetrical shape around the job you want ...