Agreed - I’ve never seen it burn at all… but you can super easily leave the protective paper on and toss some paint into the engraved area, then peel the protective paper off. Nick did this to great effect: Laser Thursday and Hello! -- Leather & Acrylic Wallet & Keychains
and alternatively, you can engrave into the acrylic and then glue some other thinner acrylic cut pieces inside… I can’t find an example of this on the forums, even though we have a bunch around the office. It makes a cool kinda inset feel - which incidentally would make the pieces easier to pick up, since you’d have a little purchase around the bottom edge