Process: 1. Design hazard symbol model in OpenSCAD 2. 3d print 3. Cover printed symbol with thin layer of epoxy (basically paint with epoxy) in order to smooth out lines of 3d print 4. Make silicone mold out of that 5. Mix LIT into transparent epoxy and cast into the mold 6. Drill holes for hooks and screw them in
This looks amazing and I have made some designs like https://beenecklace.net/category/queen-bee/