Hi all, I've been experimenting with RA4 reversal printing and I thought I'd share the results that I've had so far. The process I've been using is as follows Expose Black and white develop in Dektol 1:3 - 3 minutes Stop - 30s Wash and expose - 2 min Normal RA4 process The results have been mixed - my first attempt (first attachment) was on Kodak Edge paper from a Provia transparency (second attachment). Note the contrast increase and mottle in the sky and water. Exposure was 12s @ f11, 90/25/0 Y/M/C on a Durst CLS300 (note that Durst filter values are different from Kodak CC values). Next I tried Kodak Endura Supra. Based on the experiences of others I expected this to work the best. Unfortunately it worked the worst of the three papers I have tried and simply wouldn't produce a good white (third attachment.) The transparency this was printed off is the fifth attachment. Exposure was 8s @f11, 85/5/0 Y/M/C. Finally I tried Fuji Crystal Archive. There have been mixed reports on the results using this paper but for me it was hands down the best result (fourth attachment.) No visible mottle and not too much contrast. Exposure 10s @f16, 50/5/0. I'd like to thank Photo Engineer for his previous posts on this subject and Stephen Frizza for letting me use his darkroom. I hope this has been interesting and informative for you all! David.