Bertram and Cuddihy "Humid Aging of Magnetic Recording Tape" IEEE Transactions On Magnetics Sep 1982 Has a detailed analysis of the failure mechanism in the binder, along with some temperature/humidity curves that show the rate at which the binder can be rejuvenated. I just bought a Toyo Living controlled humidity chamber this past week to begin the exact characterization of the temperature and humidity protocol required to process 1/2 tapes so that they can be read safely. The whole "baking tapes" process has way too much black magic involved, and I have tapes at the Museum that I have to read that are irreplaceable (and VERY old) so I don't have the option of just throwing them onto a drive and see if they start to squeel. After that is dealing with DC-300's and DC-100's that I've observed with exactly the same sticking problems. Fortunately, the Museum has very few TK50s