Homebrew PCBs

Thanks for your input. Hydrogen peroxide is an excellent idea to 
start the production of CuCl2. The dark brown color your seeing 
that doesn't go away with aeration is because there are too many 
Cl(-) ions in solution (too high concentration of HCl). In such 
cases, diluting with water will turn the CuCl2 complex from dark 
brown/black to green, assuming there is no more CuCl remaining 
after the aeration period. How long did you bubble to solution? 
It can take many hours. You of course need a cover on the tank 
because the bubbles make tiny splashes.

Adam



luther m stroud wrote:
> I prefer the cucl be made with dilute hcl and scap copper and hyrogen
> peroxide 3% from the drug store. start off slow speeds up as th copper
> ions make a green solution  if the ecthant  turns muddy color from use
> the peroxide returns it to bright green .  air bubbles cause splatter and
> cool the solution. i didnt have any luck with  air bubbles converting
> from muddy to bright green , peroxide is instant.  in an australia
> electronics mag. 
> it was sugested to attach a carbon rod with insulated wire ot the etching
> board and place in contact with the solution claimed to increase the
> speed of etch.  i havent tried it out yet . what if using a battery  the
> pc board positive and scap copper negative  rejuvinating the etchant as 
> you etch your board.  a hygrometer is a weight in a tube of air with a
> calibrated scale submerged partly maybe you can inprovise something. just
> some comments to stimulate experimentation thanks luther
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