Homebrew PCBs

Actually, there is a difference in pens. I tested some on a board I
etched. The only one that lasted 100% intact for the entire etch
time was the Staedler Lumocolor 313 red. A Sanford Laundry Marking
pen was 2nd, about 75% intact. The rest that I tested were gone in
a few minutes.

Thin traces will get thinner the longer you leave it in the etch,
as once it etches the copper away it starts to under-etch the
edges.

Steve Greenfield

--- Hans Wedemeyer <hans@...> wrote:
> Great... No you can let it dry and not etch for several days! If
> you
> wait too long the copper may oxidize and be more difficult to
> etch.
> Use a waterproof marker pen to touch up any mistakes etc. There
> is no
> magic to what kind of pen. a simple laundry marker works just
> fine.
> Best Regards
> Hans W
> 
> "ghidera2000 " wrote:
> 
> >  Have the etched board in my hand and its almost a beauty. One
> small
> > void in a trace thats about 0.15 wide and a bridge between a
> pad and
> > a trace. I think the bridge is because I took the board out a
> few
> > seconds too soon. No green apparent in it. I'll soak it a bit
> longer
> > after work.The rest looks perfect though, quite a shock to me
> seeing
> > as its only the second board!
> >
> > Does the etching solution harm the resist at all? Wondering how
> > critical it is to get the board out of the etch at exactly the
> right
> > time.


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