I am planning on engraving my seed words on 12 unique plates and have them somewhat order encrypted, what material would be the best to do this on? Has anyone else engraved using an engraving pen? Brass or steel is more preferable? Any negatives come to mind from engraving seed words?

These aren't just questions but I am also posting this thread because I think it is a great idea for everyone to do, an engraving of seedwords sure seems to beat a paper copy somewhere.