I have some oldish Tri-X film ( the sort that came in 4x5 film packs) which has been properly stored, although it is dated 1984. I have just been trying to establish expansion and contraction curves using xtol diluted 1:1 in a Jobo CPA2 processor as described in athread on this forum. I have found to my surprise that the film speed with this combination appears to be only about 40!. When exposed at ASA 320, I reached a density of 0.1 above base density and fog only at zone V, implying underexposure of about 4 stops. I get the same results retesting, and exposing at ASA 80 and 160 also imply a real speed f ASA40. When I expose at ASA40 I get 0.1 above base+fog at about zone 1.5 suggesting I am not too far wrong. Is this the sort of speed loss I should expect, and is thefilm worth using or should I just dump it. The film is not fogged or otherwise unusable.
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