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RE: [APML] Cheap Dessicant to store film with
Hi Richard,
You'd definitely not want to use calcium chloride near electronics. It's a salt so metal that comes in contact would corrode. As the calcium chloride collects water it will eventually dissolve itself into the water so you end up with a slimy liquid. This is when you chuck it and buy some new stuff. While it's still dry I would assume you get calcium chloride dust that would get into everything. On the other hand it was readily available and I'm just testing it to store film. The fact that it eventually dissolves into a liquid is why I put the calcium chloride in the lower section of the container and the film up top. This will keep the film from getting wet if/when the collected water starts building up.
For those of you who store hypered film, do you use any type of dessicant for storage?
Cheers,
Jason
-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Richard Crisp
Sent: Wednesday, August 04, 2004 9:54 AM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Cheap Dessicant to store film with
one thing to consider is that silica gel is pretty intert material. I am not
so sure about calcium chloride which is basically a sodium-free salt
substitute.
I would not want to use that stuff in an electronic device such as an
expensive ccd camera.
----- Original Message -----
From: "Lane, Jason R" <jason.lane@navy.mil>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Wednesday, August 04, 2004 9:48 AM
Subject: RE: [APML] Cheap Dessicant to store film with
Hi Richard,
I was going to actually start collecting those silica gel packs to try at
first, but then I found this stuff at the store instead.
Cheers,
Jason
-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Richard Klappal
Sent: Wednesday, August 04, 2004 9:31 AM
To: Discussion of Film Astrophotography
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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