Digital BW, The Print

Paul-

It's exactly what we used to take hundreds of aerial photographs and 
make maps of an area.

Each silver print was cut and torn, then coated with gum arabic to hold 
it down to the other layers.  I cannot remember it migrating or causing 
discolorations from aging at all.

I think you can still get it in a powdered form and mix as you need it.

Seth