Quote Originally Posted by Photo Engineer View Post
AFAIK, coating at one time and coating in multiple passes in a machine causes no change in interlayer reflections or refractions. The effect is not related to surface tension. It is more like placing two sheets of flat glass in contact and you can tell this has been done as you can see it.
I agree. Each layer being in close contact with the layer on which it has been coated (that is, there is no air interface between them!), you will only get reflections when the refractive index difference from one layer to another becomes large. However, this is highly unlikely if the same kind of gelatin and silver concentrations have been used in all layers.