Last August 8 I made some notes from APUG and it was a good thing that I did because I can't find the source now.

The article or post said that Dry time is a factor according to Mark S. Pederson, a writer in APUG (can't find him either). The notes say that 24 hours drying time (of Liquid Light I think) gives a ASO of 1/4, 48 - 72 hours drying gives ISO 1/2, 5 days or more ISO of 1, and 14 days will fog emulsion.

Where is that post?

The reason is that I made a 4x5 plate and exposed it and got a picture. Howeve, the exposure was way longer than others under similar conditions, namely bright sun. The difference was that the new long exposure was cooked dry in the oven for over one hour, not dried one or two days in a cool dark room.