> 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 core of the standard plotter pens
>with a scavanged staedler pen.  You can get a bottle of the
>same ink (although it's special order around here.).
> Might try to see if it will work in an ink jet nozzle.

I believe Staedtler make a substitute pen for fitting to plotters for doing
exactly this. The tip is a ceramic disc a couple of mm diameter, and it is
refillable. The pen is designed for plotting onto draughting film to plot
masters in a draughtmans office. I cannot remember, but I think the ink that
Staedler supply will also plot straight onto the copper surface of the
board. The ink capillaries down the pen in the way that Olin described, and
the ceramic tip is extremely hard wearing.

I saw this described in one of the electronics magazines, but cannot
remember just which one. It may have been Electronics Australia, or could
have been Elektor, or Electronics and Wireless World. Which ever one it was,
it would be over 5 years ago now. However I do seem to recall that someone
also had the information on the web. Unfortunately I do not seem to have
kept a link to it.

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