John, I have a few unused Agfa Farbenplatten glass plates. I decided to take one out of the box and put it in some fixer to have a look. When washing I found the pan-emulsion was very soft (likely needed some hardening) and with a little warm water peeled right off. The starch-dye layer is on the same side under the emulsion and although fragile protected with a varnish or lacquer coating. In use these plates would be used with the glass side forward. Exposing thru the glass then the starch-dye layer to the emulsion. They come with a sheet of card to protect the emulsion from the springs in the plate holder.

Geogre