Re: [APML] Cheap Dessicant to store film with

["Richard Crisp" <rdcrisp@earthlink.net>]

the typical silica gel dessiccant can be recharged by baking 10-16 hours at
235F. sometimes the wrapper will melt though so not all of them are tolerant
of that temperature.

I use the stuff in my CCD camera to keep it from frosting. I usually open
the containers and pour the pellets into a baking pan before I bake it out
to avoid having a gooey mess.

Then I put it into a thin paper container I make by folding and taping and
or stapling a sheet of paper. it works great in the CCD camera.


----- Original Message ----- 
From: "Richard Klappal" <klappal@xnet.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Wednesday, August 04, 2004 9:30 AM
Subject: RE: [APML] Cheap Dessicant to store film with


> You can also use the silica-gel packages that you find packed with various
> cameras, lenses, electronics, ...
>
> Many of them can be regenerated by gentle heating, but I don't recall how
> warm the need to get.  Its not much.
>
> Places like American Science & Surplus (www.sciplus.com, I think), Edmund
> Scientific, or similar, may also carry them; they are used in chemistry
> laboratories for sample drying.
>
>
>
> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Lane, Jason R
> Sent: Wednesday, 04 August, 2004 11:12
> To: Discussion of Film Astrophotography
> Subject: [APML] Cheap Dessicant to store film with
>
>
> Hello all,
>
> One of the objectives of hypering film is to remove moisture from the
film.
> >From my limited knowledge of how hypering works, the removal of moisture
is
> one of the reasons hypered film has greater sensitivity and/or less
> reciprocity failure.  Since I don't have access to a hypering system nor
> will I have one anytime in the near future, I've always wondered if
storing
> film long-term with dessicant would be of any benefit.  Naturally it
> wouldn't be as helpful as hypering, but maybe it helps a little bit
without
> the large investment that hypering requires.
>
> I recently discovered that Wal-Mart sells a product called "Damp Rid" in
> their cleaning supplies section.  This is 18oz of calcium chloride, and
the
> product is designed for use in damp areas of the house to reduce musty
odors
> and humidity.  The package is relatively inexpensive...less than $10.  The
> container has an insert which divides it into upper and lower sections.
> Normally you would put the calcium chloride in the upper section to let
the
> water drain down to the lower section, but for this I put the calcium
> chloride in the lower section, 5 or 6 rolls of film in the upper section
and
> sealed it in a Ziploc bag and stored it in the fridge.  The ziploc is
going
> to be temporary until I find something that gives a better seal (I was
> thinking a big Mason jar).  Through normal use, some of the rolls will be
> stored in there over the course of several months, so I believe I'll get a
> good set of data points from a few weeks' storage to a few months'
storage.
> I can then compare these to photographs I've already taken of deep sky
> objects and see if there was any effect.   I can also try variations on
this
> theme, like baking at low temperatures to help the process along.
>
> Thoughts?
>
> Cheers,
> Jason
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