[pure-silver] Re: Refrigerate film?
- From: "mail1" <mail1@xxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 19 May 2008 10:20:47 -0700
Storage of raw film from "the Book of Film Care" Kodak Pub H-23
"When film reaches an appropriate moisture equilibrium after manufacture
it's put into a film can and sealed with tape. The can is now usually
impervious to normal levels of relative humidity, but some cans may rust.
Short turn storage in low or high relative humidity isn't immediately
threatening so long as the packages of raw film remained sealed.
Cold temperatures are best for slowing the inevitable changes in
sensitivity. If raw stock must be kept for period of up to 3 months,
temperature of 55'F or less are appropriate. If raw stock must be kept
longer than 3 months freezing at 0 to -10F is recommended. After any cold
storage be sure to allow the films to equilibrate slowly to ambient
temperature. This is necessary to prevent moisture condensation and
spotting. Conditioning time will vary with the thickness of the package and
the temperature and dew point of the outside air. A 100-foot roll of 16m/m
can take as little as 1/2 hour to condition whereas a 1000foot roll of 35mm
may take up to 3 hours. Do not open the packages if they feel colder than
the ambient temperature. Always use film soon after purchase"
Obviously Kodak is writing about movie film. The section on effects of
Ambient-background radiation on raw stock, and the long term care and
storage of processed film is also interesting.
Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx]
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Monday, May 19, 2008 5:25 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Refrigerate film?
-----Original Message-----
>From: Peter Badcock <peter.badcock@xxxxxxxxx>
>Sent: May 18, 2008 11:13 PM
>To: pure-silver@xxxxxxxxxxxxx
>Subject: [pure-silver] Re: Refrigerate film?
>
>Nicholas,
>
>Are you also looking for a lensing effect of the condensed water droplets
>that would optically distort the image ? Perhaps such a lensing effect is
>already well documented and constitutes more concern than actual damage to
>the film itself.
>
>To ensure you test out lensing effects, you need to take photographs during
>the period that there are water droplets on the film. Presence of water
>droplets can be checked by looking at the leader of another roll of film
you
>removed the same time from the freezer.
>
>regards
>Peter
>
>2008/5/18 Nicholas O. Lindan <nolindan@xxxxxxxxxxxxx>:
>
The problem is not focusing of light by droplets but rather distortion
of the emulsion layer by the water which can leave mottling and marks like
water spots from droplets when film is drying. The warning is universal in
the literature and in Kodak's instructions. While modern emulsions are
harder than those of the past and should be more resistant to this kind of
damage it can still happen. It may not be necessary to wait very long when
opening film that has only been refrigerated but frozen film should be
alowed to warm up for some time before opening. I will see if I can find the
Kodak bulletin about this.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
Los Angeles, CA, USA
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