Hi ! I've opened, this morning, my first box of Classic Pan 200 4x5 sheet film. I've found the film to be very well packaged (usual triple cardboard box, plus a sealed pouch for the film which is wrapped in a paper sheet !) Between each sheet there is a very thin sheet of black paper. I wonder if this paper is only here to protect from finger prints and scratches, or if it has to be put under the film sheet during exposure to provide anti halation protection ? TIA for your help ! And have a nice day !