Roman, I think this was intended at my flaky idea of statically charging etc then melting toner on the copper. Industrial chemist hey, that's handy. Someone mentioned the ink used to date code products like soft drink bottles. It certainly is water insoluble, however I was led to believe the stuff is quite poisonous. They had quite a procedure at coca-cola for the refiling and disposing of empty containers. Justin My original spec of using special ink in a bubblejet followed by etching and SMD hot air soldering is not flaky at all. <> -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads