I saw an artist in Baltimore this past weekend that was etching
something they called “12% copper backed fine silver”. They had some
samples of the etching process mounted on foam core to show the
steps. The beginning metal was copper on one side and fine silver on
the other. The booth was so crowded that I was not able to ask (and
didn’t want to get in the way of their sales either).
Does anyone know a source for this material?