NB. I'm starting a new thread on this as my old thread on the general subject had become unwieldy and too digressive. And so this thread aims to be based around one question. Context: I'm dev'ing 35mm Tri-X reversal in order to practice before moving on to the more expensive Super 8 Tri-X Reversal. I'm using Dektol liquid (i.e. Polymax). At the moment I am only trying to find the maximum dev time until base-level fog is reached. As some of you will already know this is meant to be important to get clear hilights when reversal processing. This test should also tell us how long the developer takes to build maximum silver content on the film before any EI tests are done. I am using the Dektol paper developer for it's energetic nature, as is required in reversal processing (check the literature). It has been used for reversal processing very successfully with a lot of other films - e.g. by Mr. Red. I do not have densitometers so am trying to do this the simple way. Process: I am using Dektol liquid at 1+5. This is the equivalent of Dektol powder stock at 1 + 1. (ie. - strong.) I am testing on unexposed Tri-X 35mm. 5 mins . No fog. 10 mins. No fog. 15 mins. No fog. 20 mins. No Fog. NB: I do get black on the exposed part of the test strip and the edge lettering. Question: Why am I not seeing fog? I have had the same results with PQ Universal where I can get a usable image at a reasonable 10m but cannot get fog at 16m. I'm convinced that I'd get a fully developed image by 5 mins with Dektol. This method of getting base fog and hence finding ideal max dev time sounds great in theory does not seem to be working (at least with Tri-X for me). Is there another way of getting the dev time near correct before doing EI tests, please?