I found I still had a box of these...  Staedtler lumocolor 313 --Red (a
little better etch resist properties than the black).  These can write on
glass, metal, etc. w/o beading up.
----- Original Message -----
From: "Dal Wheeler" <dwheeler@insightek.net>
> When I played with this kind of thing on an old HP plotter, the
recommended
> resist pen ink was a staedler red felt marker.  I replaced the felt soaked

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