Bravo - Encore - it worked. I followed the instructions at this link http://www.qsl.net/ve2emm/pcb/pcbe.html Thanks alienrelics. It works beautifully. The Staedtler 318 red pen is tops. After 25 minutes in the ferric chloride, there is absolutely no breakdown in the ink. This leaves beautifull, accurate tracks. Finally a cheap accurate way to print pcb`s.
I used autocad 2000i to draw the artwork and the Roland DXY 990 plotter to plot.