You can get an idea from looking at the raw data. The density difference between the top an bottom step is 1.53 for white light and 1.59 for blue, so there is some image stain effect, but probably not much. King has pointed out, however, that effects can be greater in the ultraviolet. As for emulsion speed, there is no toe area to get real speed point measurement, but from the low density data I would estimate that D-76 gives about half a stop more speed than Simple Pyro. The step tablet exposures were based on EI 100, reading the light box intensity and opening up 5 stops. This works well enough to give useful curves, but there are enough uncalibrated things involved that I wouldn't rely on it for real speed measurements.
Originally Posted by Michael R 1974
Last edited by nworth; 06-21-2012 at 04:17 PM. Click to view previous post history.
Reason: Added comments about UV