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>The page can be found at
> > Whether the copper is oxidized to Cu^+2 can be determined
> > by color. I just bubble air until all traces of brown/mud
> > are gone as per Seychell's instructions.
>
> He had a great web page describing the process but it seems to be
> down. Does anyone have an archived copy of the page?
>
> http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
> <http://members.optusnet.com.au/%7Eeseychell/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
>
>