Robert's results are very interesting. I posted my first impressions of R³ a while ago, but it might have been on pure-silver. Can't remember - I'll have to fish around...
There is still a lot of messing around with R³ that I'd like to do - just a matter of finding the time, and work tends to get in the way. R³ and Cube seem to reward effort to get things 'just right' and I'm just curious and fanatically dedicated to film. This has nothing to do with taking pictures, of course. I suspect that R³ deserves the kind of fanaticism that Super XX generates. Anyway, please regard my ramblings below as my raw thoughts about work in progress.
In brief:
The 120 R³ I have is not edge marked. It is rather curly, and not much different from 120 Cube 400c, apart from the total lack of edge markings.
The 135 R³ is numbered and identified, but the numbers are out of sync with the cassette loads. It is clear and not curly - quite different in that respect from Cube 400c.
These teensy-weensy problemettes may have been restricted to early batches, I don't know.
I liked, and used, Cube 400c, so I came to R³ with some experience. I have found it to be a very versatile film, capable of coping with a very wide scene brightness range at the lower speeds. I used to use W2D2+ for Cube, but I've been trying the Rollei Low Speed and High Speed developers with R³. They appear to be good combinations. So far I prefer the results as a negative at 200 and below to those at 400 and above - but that is just my taste.
It reverses very well at the higher speeds, and is ideal in many ways: there are plenty of very fine grains that survive until the reversal developer, so the final image has very low graininess. I have no definite idea why, but permanganate bleach gives a longer density range (lower D-min) than dichromate bleach, all other steps being the same. That's a puzzle that can only be explained by incomplete bleaching by the dichromate, I think, but I really don't know yet and I need to look at bleaching times. I'm using PPD with sodium dithionite (also tried Amidol with sodium dithionite in bisulphite) for the second dev. (you might need to know that I'm trying to optimise for scanning with a Nikon 5000/9000, not for viewing on a light-table or projection so all of this is of limited relevance here. Sorry folks!) I still have a lot of tweaking to do though.
Robert,
What is CG 512?
Best,
Helen