Here are links to more information, supplies and tools to use in electrical etching of metal for jewelry.
Ready Stamps have your own rubber stamps and matrix trays made
Reactive Metals Studio sources for PnP transfer paper, metals and supplies
Rings & Things PnP paper and jewelry making supplies
Rio Grande sheet metal and wire, tools
http://www.sculpturedepot.net/clay-wax-tools/product.asp?Patina_Dry_Chemicals other patinas/chemicals