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Subject: Re: [Homebrew_PCBs] Persulfate etchants

From: Adam Seychell <a_seychell@...>
Date: 2009-04-07

Simao Cardoso wrote:
> Hi,
>
> I have this question for long time, at the wikipedia entry of ammonium
> persulfate of my language is written:


Most people who produce ammonium persulfate would do so by electrolysis
at cold temperatures with platinum anode at high current density in a
solution of high concentration of ammonium sulfate. The solubility of
persulfate is significantly lower than sulfate and allows separation.
High anode current densities increase persulfate/oxygen ratio since some
water electrolysis is unavoidable.

I don't think any the chemical reactions you describe would make
persulfates.