I must be missing something in your reply to Gwen:
>We have tried many systems at Kingsway College London.The best so far
>produces a negative which is not strictly continuous tone but does give
>the impression of full tonal quality when printed , as follows-:
>
>Make a RC print using normal enlargement technique make the print slightly
>soft
>with plenty detail in the shadows and highlights, ideally the print should
>look slightly soft and heavy.Take this print down to the repro-shop and get
>them to make and identical print on there colour printer we found the canon
>800 and above which gave a copy that looked identical to the original, it
>is only when this copy is examined with a loupe, that the image can now be
>seen tobe made up of lines of varying thickness.
>
>Take this repro-print back to the darkroom and contact onto your ortho
>lithographic film, make sure you have contact printer that gives very good
>contact.
>Develop this film in a normal print developer, we found it
>advantages to give the exposed film a print soak in warm water for about 30
>secs before development.
If you use a repro-shop, why not take your RC positive print to the shop
and have them make a negative of it on the color copier onto transparency
material? In one simple step you have a very usable negative on transparent
film.
And if your repro-shop Canon Color Copier has a RIP connected to it, you
can scan your RC print image on a flatbed scanner, reverse the image to
negative, and send the file to the RIP and have it output to transparency
material as well. (Gee, we keep getting back to digital negatives.)
Sam