Re: [APML] Out-gassing(sp?)

[Philip Perkins <philip@astrocruise.com>]

Jeff,

With colour film, I would recommend purging rather than any specific 
attempts at outgassing.  Out gassing will mostly expel water vapour from 
the film and my experience is that when you do that to any significant 
degree then a number of undesirable things start to happen.  A small amount 
of out gassing is OK - after all this happens even with the hand pump when 
the chamber is heated, except in that case we would call it evaporation.  I 
believe that the term outgassing strictly means driving off gases under 
high vacuum, and that (in my experience) is definitely undesirable with 
colour film.

--Philip

At 22:25 26/09/01 -0400, you wrote:
>Hello All,
>I am curious as to the best method for outgassing film prior to hypering.  I
>have the 600 Lumicon chamber and 50Deg probe.  Thanks for any help on this.
>
>Jeff Ball
>Astrophotography
>www.astro-photography.com
>Ohio Valley Astronomical Society
>www.ovas.org



Philip Perkins - philip@astrocruise.com
Wiltshire UK & Luberon France
Astrocruise - http://www.astrocruise.com


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