I learned about electrolytic etching from Alison Lesniak's blog. http://copperheartdesigns.blogspot.com/2010/01/electrolytic-copper-etching.html. She makes beautiful etched jewelry and I've purchased her beads for use in my own jewelry designs.
Necklace made with one of Alison's beads
Check out her lovely shop: copperheartdesigns.com.
My banner for my blog & the related shop is, in fact, a photo of a copper etching that my husband made. It features a female widow skimmer. The widow skimmer is in the family Libellulidae and Genus of dragonflies that are called Libellula.
I'll post some photos soon!