Homebrew PCBs

Na2S2O8 (and other persulfate salts) are produced by 
electrolysis of almost saturated Na2SO4 + sulfuric acid at low 
temperatures (~0\ufffdC) and very high anode current densities. The 
Na2S2O8 produced at the anode is less soluble than Na2SO4 and 
thus collected as a precipitate.
	I doubt it would be worth your while regenerating spent 
persulfate etchant on a small scale. There are other 
regeneratable etching chemistries to play with.


Radek Zitek wrote:
> I have tried to use the natrium persulfate (Na2S2O8) for etching and 
> remember reading somewhere that it can be regenerated. Any pointers 
> where I could find more...
> 
> Thanks, Radek
> 
> 
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