diy pcb making problem (acid + oxygenated water)

Rafael Ignacio Zurita rafaelignacio.zurita at
Fri Aug 28 12:16:40 UTC 2015

On Thu, Aug 27, 2015 at 12:48 PM, Werner Almesberger
<werner at> wrote:
> Rafael Ignacio Zurita wrote:
>> I got that "interesting effect" in few boards I tried :(
> I've never seen anything like this. Maybe the toner chemistry
> is unusual.
> Did you clean the PCB with alcohol before applying the toner ?
> When cleaning, you'll also remove any (usually black) residues
> from the steel wool you used for scrubbing.

Werner, your tips did this now :

Thanks a lot! I did both tips, a good cleaning of PCB and less
muriatic acid than oxygenated water.

Now I can rest


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