Dave Bell wrote" >Tony, I'd rather say "elegant"! And any over-etch would only serve to thin >the edge, better approaching the ideal zero thickness hole... Thin brass >stock is available at the nearest craft store (for embossing paper), and >wouldn't ferric chloride from the electronics shop do for etchant?
Ideal, as it doesn't produce fumes like acid. Don't leave it uncovered next to any precious metalwork however as there seems to be a vapour reaction over a long period. > >Ideally, you would probably want photo resist, which should still be >available the same place, but how about paint, sprayed over press-apply >dots? Apply the dot diameter for the hole, paint both sides of the brass, >then pick off the dot with a needle and etch. Should work! The only trick is judging the pick-off moment. Too wet and it might smear, too dry and the paint edge will flake. I recall mentioning this when discussing tricks for multi-colour anodizing of aluminium some months ago. Regards Tony M. -
