Thanks for the encouragement, guys. I've been looking at my camera shutter speeds and reading the literature so have been quiet on this. I've come to decision on Tri-X Reversal 7266.
After work commitments I have limited time. Tri-X experiments are now becoming an impediment to my project and my pleasure. It's a drain on time and energy and not giving anything back.
I've followed the processes that other have used successfully (Rodinal and D19 for example and I also tested PQ and Polymax(Dektol) ) and just not got the results. I do believe it should be possible to replicate other's process within acceptable limits. With the speed loss i am seeing, it looks likely that I am doing something wrong but still do not know what but can't expend more time worrying about it.
Thanks both for your ideas above, but I feel that I cannot spend another two weeks testing new chemicals* and processes as a workaround to fix something that should work without – and has worked without for many people. When I used Tri-X Super 8 many years ago with the Tetenal Reversal kit it was great. It looked wonderful and worked first time and every time. Today, at this particular moment, processing Tri-X Reversal film feels like flogging a broken horse from where I am.
But I do have to develop the film myself for the pleasure (I actually enjoy it) and the process. It really needs to be part of my film work. So I'm looking at reversal films like Scala 200x and Adox Pan-X 100 to get out of this fruitless Tri-X loop, at least for the time being. I already have a cartridge of Adox Pan-X Reverso in the fridge and might run a few test strips this weekend. If that also fails then my method is wrong somewhere and I need to look at that again. If it succeeds then Pan-X might be a better short to mid term solution leaving the Tri-X Reversal mystery behind me.
(Also I have been hoping that Adox will get their Pan-X Reverso reversal kit out soon)
The speed rating of TriX Reversal is not really an issue. Tri-X is panchromatic, afaik. The dual film speed rating is surely to account for cameras which have a tungsten 85a filter built in. The Tri-X cart auto switches it out on my camera. But I'm also exposing manually with a Weston using incident reading and using 32k Bowens light.
My camera shutter speed at 18fps single frame is accurate and so is my Weston meter tested against two camera meters. So I still read my best result as 100ASA at 12mins max strength developer. So if I can only get 50-100ASA from Tri-X I might just as well use another true reversal film. One with a clear base, to boot.
*With what you explained to me and now I've read the document 'A Black&White Reversal Process In Memory Of Agfa Scala 200x' I think I'm much clearer on the silver solvent question. It's more important with low speed films. I think with a fast film like Tri-X and it's thin emulsion it only serves to make the whole image too weak at 1st dev stage.
'The amount of silver solvent needed depends on the amount of silver halide in the film and the strength of first development. In principle, lower speed films contain a higher amount of silver halide; they are more capable to build maximum densitiy in the negative. A lower amount of developer concentrate in the first developer creates a softer negative image and leaves more unused silver halide requiring more silver solvent and vice versa.'
Last edited by mr.datsun; 03-14-2013 at 08:29 PM. Click to view previous post history.