Engraving on cork coaster

I bought some cork coasters and would like to engrave on them. I have looked everywhere for tips and help. and no help any where. So here i am hoping someone could help with settings. I did try a couple and nope. didn’t work.
Please if you have done some I would love the help
I have the omtech polar 350
Thank you

1 Like

Am I guessing right if I said you probably over cooked them?

What did not work?

Can you share some photos of the results along with the settings you used ?