Wow dood. This is my first day on this site and I stumble across this thread. I am more amazed that you have tackled etching at your home. Etching is not the simplistic of hobbies to tackle. I mean, I guess it could be, but here at work we use big horizontal etching machines. We also use ferric chloride for most metals (copper, brass, SS, Kovar, Invar, CRS, Nickel Silver and so on). I like your methodology of ironing on your design. We use giant printers and photoresistant lamination. Great stuff... I've only been in the chemical etching business for a little less then 2 years and this job just fascinates me.