Re: [APML] Vacuum baking

["Don Westergren" <westergren@netzero.net>]

George,

In my film testing, I tried just a vacuum baking (at about 28 in Hg) on the
good Old Royal Gold 200 without the forming gas.  It just didn't work.  I
couldn't see ANY improvement over the unhypered film.  Actually, your
question is kind of moot now, since I don't know of any currently available
films that can benefit from hypering.  Of course there are many films, like
Konica Centuria 400 that haven't been thoroughly tested for hypering effect.
It takes a lot of rolls of film and a lot of time to evaluate hypering. For
instance, I hypered four rolls of Supra 400 from 31 to 80 hours at 30°C to
find that it didn't help. It took 5 rolls of the new Royal Gold 200 to find
the best recipe for hypering.

Don

> Part of the hypering process involves vacuum baking to remove moisture
> and impurities from the film.
> For films that react well to hypering, would just vacuum bake portion of
> the process provide any improvement to the film? Or would I just be
> looking for trouble with film creep due to moisture ingress since I
> don't have a nitrogen or dry air purge system on my camera body?
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
> PS: Happy Fourth of July to our southern neighbours
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