Quote Originally Posted by Hologram View Post
I guess the wetting substances (being essentially hydrophilic) would get fully absorbed by the gelatin-water layer to be coated on top of it.

If there are wetting agents in both layers, what I assume, and if they are of that typical kind we know (a hydrophile next to a lipophile part), what I assume too, the hydrophile parts would be incorporated in both layers with the lipophile parts sticking out.
Thus there not only would be an inhomogenity in both layers due the gathering of these wetting agents to the interface, but even even a layer made out of (or at least characterized by) those lipophile elements.

Am I wrong?