[pure-silver] Re: Refrigerate film?
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 19 May 2008 09:28:56 -0400
DEAR LIST,
I think we are forgetting one variable which I am NEVER allowed to
forget living on a tropical isle...the relative humidity.
If one lives up north and takes some film out of the fridge on a
winter's day when the rel hum is 20% there is much less chance of humidity
building up on the film. For me, from December to May the rel hum is
between 50 and 60% so I let the film warm up at least two hours from the
freezer. When the rains start in June and even more so from September to
the end of November, if I walk out of my air conditioned office/darkroom
(c.a. 75 F)while still wearing my reading glasses, they fog over!!! On many
days the rel hum is in the high 90%s. Imagine what would happen to film
if I brought it out of the freezer and immediately removed it from its
hermetic seals.
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Monday, May 19, 2008 8:25 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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