The other factor that may be at play here is the characteristic curve of Azo. I read the reflection densities of my test which indicated the negative density range that Azo would accomodate but I did not plot curves for the paper. I could do that since I have all of the data. The thing that may be occuring is that the curve of the film could be interfacing with the curve of the paper in such a way that an unattractive compression may be occuring. I could certainly see that possibility with the shadows lying on the toe of the film's curve and then falling on the shoulder of the paper. That would be a recipe for flat shadows.
Originally Posted by David A. Goldfarb