Homebrew PCBs

On 3/08/2013 9:16 a.m., Philip Pemberton wrote:
>
> On 01/08/13 02:33, Harvey White wrote:
> > Why bother to go that way when the copper from the boards you would
> > etch would do the same, and get the boards etched? With a lot of
> > oxygen available, you'll find that these boards will etch rapidly in
> > the fresh mixture. As the O2 from the peroxide dies off, the bubbled
> > air will substitute for that and you're building your CuCL2 etchant.
>
> I mixed the stuff up yesterday, but I think the etchant might be a bit
> short on oxygen - after an hour or so it turned a dark brown and pretty
> much stopped reacting with anything.
>
> I've left an aquarium air bubbler running overnight with the copper
> removed. I'll see what that does but it doesn't look promising and I'm
> out of H2O2... :-/
>

Try some sodium percarbonate, 1 teaspoon/50ml of water, readily 
available as a cleaning agent. Add very slowly as it releases CO2 and O2.

> Thanks,
> -- 
> Phil.
> ygroups@... <mailto:ygroups%40philpem.me.uk>
> http://www.philpem.me.uk/
>
> 



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