Okay, this is my latest experiment in film archaeology. I got a sealed box of 25 sheets of Royal Pan 4x5, exp. 1965. Is Royal Pan the same emulsion as Royal-X Pan? Anyone have any favorite developer combos/speed recommendations for this one. I found an old recommendation for Royal-X Pan in Acufine, EI 1600, 10 min at 21 deg. C, and I'm tempted to test the first two sheets at EI 1250 and 800, figuring it has to have lost some speed. The instruction sheet has times for Polydol (what was that?), DK-50, D-76, Microdol-X, and even Dektol (1:1) at EI 400.