You said a you had a lack of contrast with Thornton's formula. Well he actually saw that as a good thing. That is why he used it when film was shot under contrasty lighting. Also it is good to prevent blown highlights with Tmax film.
Exactly how did you do your test. If one roll was shot under high contrast light and the other under flatter lighting that might be the difference. I don't see how you would lose activity and contrast by using the Thornton's formula A bath.
Also there is development in bath A with this 2 bath formula so the time and temperature in bath A is important here. Test it out yourself or see the formula for D23 if you doubt me.
Last edited by brianmquinn; 07-29-2013 at 08:33 AM. Click to view previous post history.