Sula, rather than engraving your Celtic designs, try the method in
which you draw your design, photocopy it onto PnP paper, apply that
to your metal, then etch it in ferric chloride. It should be much
simpler and more satisfactory. For how to do this process, see
Katherine Palochak’s very helpful articles in Lapidary Journal, March
1999 and June and July 1998. PnP paper is available from Reactive
Metals, Inc. Judy Bjorkman