Possibly slightly odd question here - I'd like to use glass (as in the stuff you have in windows, not fibreglass) as a PCB substrate, approximately A5 (210x150 mm) sized. As far as I can see, there's three options. The first is to stick some copper foil on, the second option would be to evaporate copper onto the glass, and the final option would be to use electrolysis. Afterwards I'd do the usual photoresist/etch steps to get a PCB. I can't seem to find much information at all on any of these. The main things I'm looking for are surface preparation tips, and things to avoid due to them reacting badly with the photoresist.
One thing that makes it slightly more complicated is that the glass must remain transparent (outside of the tracks). Roughing the surface will probably be OK as I'm going to be using an optical epoxy to sandwich the PCB side (with SMT components) to another piece of glass, but I don't want the copper to bleed into the glass (which would presumably result in a green tint).
Any tips/links appreciated, or if anyone knows where pre-coated glass can be obtained from in Australia let me know.