> Whether the copper is oxidized to Cu^+2 can be determinedHe had a great web page describing the process but it seems to be down. Does anyone have an archived copy of the page?
> by color. I just bubble air until all traces of brown/mud
> are gone as per Seychell's instructions.
http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
It covered how to determine optimum pH, specific gravity, temperature, etc and was probably the most thorough coverage I have seen given to the topic.
Aaron