I've made a little test and have found another permanent marker that works
better for me.
It is Faber-Castell, OHP-PLUS1523.
In FeCl solution it was still on the copper when Staedler Lumocolor was
allready gone.
Anyway results was not satisfactory, maybe a different kind of solution
required. The copper under the marked lines was damaged a bit.
KPL
> >
> > Listed as waterproof and permanent. I'm going to pick
> > one up and try it. I'll let you know how it works.
> >
> >
>
> DO, please! Jan Rowland
>
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