Quote Originally Posted by MartinP View Post
So, what we really could do with is a list of tips for using Portra (sheet, roll or 135, as appropriate) as an interneg or dupe film, in order to print from transparencies on to RA4.
Supposedly you can cook up a special developer which turns RA4 paper into pos-pos material.

Still, neither Ilfochrome, nor pos-pos RA4, nor inter negatives will develop those outstanding Kodachrome rolls ...