Quote Originally Posted by Photo Engineer View Post
There are no homogenieties at the interface.
Problems caused by wetting agents might include changes in refractive index or changes in silver type or grain size or coupler (in color), or combinations.
...or increased/decreased silver halide concentrations. The Bruce Kahn photo (Cross Section of EXR 5296, “before processing”) - thanks for posting! - seems to suggest uneven silver distribution within a single layer. The bottom of each layer may have a considerably higher amounts of AgX than the upper regions. I wonder if this is always the case or relates to surfactants, AgX concentrations of the coating solutions.
So if high AgX regions border on low AgX regions, it might explain the refractive index difference and hence the internal reflections.