Here’s another crazy way around getting your image on copper. Go
ahead and print your wood block image onto WAX PAPER using an oil
based ink (I’ve used Graphic Chemical’s Perfection Palette line).
Color of the ink may not have much, if any influence on the outcome.
Next, while the ink is still wet, make an offset print onto the
copper from the waxed paper (coat the back of the copper first with
an acid resistant coating). After printing, place the copper in a
ferric chloride or Edinburgh Etch solution. Don’t wait for the ink
to dry, just put it right in the tank. The image develops fairly
quickly, say 10-20 minutes, and generally has a slightly softer
focus than the original. It appears that the corrosive attacks the
ink before it attacks the copper, so the image develops without the
aid of a resist. I don’t know at what point it would start to
deteriorate, but it’s a process with potential. Use all reasonable
safety precautions when working with corrosives. – M. Whittle