> 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 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
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Re: Long-Term CuCl2 setup
2012-05-08 by Aaron