RE: [APML] Vacuum baking

[georgea@cam.org]

Many thanks Kent and Chris

I realize tht a partial process will not come close to matching the full 
hypering process. But until I can locate a source for forming gas from a nearby 
dealer I am exploring a few other options for B&W film.
I'll split up a couple of rolls into batches of three since I won't be able to 
manage more than six or eight shots per session.
And I'll look into modifying the spare back for my pentax to accept a purge 
line.
I hope to have some results on one experiment on wednesday if the cloud gods co-
operate.

George Anderson
Montreal Canada

Clear skies and good health 

Quoting Chris Schur 

> George, well, baking in a vacuum is like heating a thermos bottle. Radiant
> IR still gets to the film however and you can expect up to a 2x speed
> increase until the film rehydrates.
> 
> Chris Schur
> 
Quoting Kent Kirkley
>George:
>Early experiments at Kodak (1970's) revealed that all the 'parts' of the 
>hypering process
>contribute to the final result, but none individually are as good as the whole.
>
>The process consists of 3 parts:
>1. Dessication by placing the film in a vacuum. This removes moisture and 
>oxygen, etc. from the film.
>2. Introduction of Forming gas (92% Nitrogen 8% Hydrogen) or pure Hydrogen.
>3. Baking the film at an elevated (50 deg. C) in the gas for a period of time.
>
>Kent Kirkley




> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of George Anderson
> Sent: Sunday, July 04, 2004 7:55 PM
> To: APML
> Subject: [APML] Vacuum baking
> 
> 
> 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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