Yes. glad to... but give me a short while - a day or so - to recalculate the details and write it up.
Jim H
Received from Dave at 3/22/2019 02:25 PM UTC:
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Jim,
Could you explain more on how to make the mix with the copper wire? I like the idea of less corrosive fumes.
Thanks,
Dave
On 3/19/2019 2:39 PM, Jim Higgins wrote:
If you're adding H2O2 to the solution, you don't need bubbles to regenerate since the oxygen from the H2O2 will do the regeneration.
Personally I'd make a solution of copper wire in HCl and H2O2 and do my etching with that, using air to regenerate. No H2O2 after the initial amount needed to get the reaction started to make the solution, and once the initial solution is prepared, only a bit of HCl left over. Let the cupric chloride in the solution do the etching and regenerate with air... adding a bit of HCl when the solution won't fully regenerate or if etching produces a persistent brownish color. That approach also virtually eliminates the HCl fumes everyone seems to be so concerned about since there isn't a great excess of HCl.
Jim H
