I bought a box of 4X5 Kodak Royal Pan 4141 at a camera show. It appears to be factory sealed and the seller, a guy I know and trust, said it's been refrigerated, but it is very old. There's no expiration date on it, but the lot # is 4141 565 16, if that means anything to anyone on this list. I haven't opened the box yet so don't know if it contains developing instructions, and Royal Pan isn't even listed on the Massive Developing Chart. My plan is to develop and fix a sheet in the dark without exposing it to see if there is a base fog, and to do the same with another sheet after fully exposing it to light to see how black it gets. I have Rodinal, D-76 and DK-50 on hand. Any suggestions on developing, or ISO if I decide to shoot with it (as opposed to just experimenting)? Marty