Experimenting with coasters.
The base on the cork one was turned at the lathe to match corksize. I wanted to laser cut the cork but the cork mostly burned rather than cut. I used sealer (polyurethane) to stop the burned areas from smearing after imaging.
The slate was etched using @Nedman 's recommendation and it was also sealed with urethane.
The slate was purchased from Michael’s per Neds suggestion