[sdiy] Audio circuits and basic electronics knowledge recommendation.

[David G Dixon]

Ammonium persulfate is a strong oxidant.  It dissolves copper by oxidizing
it to the cupric state thus:

(NH4)2S2O8 + Cu --> CuSO4 + (NH4)2SO4

A byproduct of the reaction is ammonium sulfate, which is a fertilizer.
This is very simple and effective chemistry, and I suspect that it is the
most efficient and easy-to-use etchant system.  However, it's also a little
bit costly. 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] 
> On Behalf Of Olav Martin Kvern
> Sent: Friday, March 04, 2016 11:01 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Audio circuits and basic electronics 
> knowledge recommendation.
> 
> Hi David [Dixon],
> 
> re: alternatives to Ferric Chloride
> 
> I've been using Ammonium Persulphate for years, based on a 
> photo-process writeup that Ray Wilson used to have on his 
> site. This works amazingly well, and I much prefer it to 
> Ferric Chloride. Any comment on the chemistry of this approach?
> 
> Thanks,
> 
> Ole
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