Really old infrared film

[Bertha Adamson <badamson@xxxxxxxxxxxxx>]

In sorting through my film inventory I found a old roll of 35mm Kodak HIE that
a friend had given me some time ago.  The year is 1975.

I know that it is probably only fit as a practice roll for bulk loading, as a
film museum exhibit or as a slinky toy for the dogs, but I am half tempted to
shoot and develop it anyway, to see what happens.

However, that did make me wonder how long HIE will last past the expiration
date.  I know many B&W films are actually good well past the date, if properly
stored.  This is relevant because I also have a roll dated Jan. 1999.  (Yeah,
I know, I'm obviously not shooting enough infrared - a situation I hope to
remedy soon.)  Is infrared a lot more susceptible to age and environmental
factors?  Is HIE more susceptible than Konica?

Thanks for expanding my IR knowledge, or even for really cool really old IR
film anecdotes.
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