[Leica] FS: Film from the freezer

[Mark Rabiner]

The Effect of Gamma Rays on Man-in-the-Moon Marigolds.



On 10/1/15 10:19 PM, "John D. Nebel" <john.nebel at csdco.com> wrote:

> In 20 years, cosmic rays may have slightly fogged the ASA 400 film, be
> interesting to see.  Worth a go anyway.
> 
> "Ambient Background Radiation (Effects on Raw Stock
> Ambient gamma radiation is composed of two sources: a low energy
> component which arises from the decay of radionuclides and a high energy
> component which is the product of the interaction of cosmic rays with
> the earth's upper atmosphere. The radionuclides responsible for the
> low-energy photons exist in soil and rock and are carried into earth
> derived building materials such as concrete. Lead shielding or storage
> deep underground may be helpful, but for long-term raw stock storage,
> radiation will still be a factor. Upon exposure to ambient-background
> radiation, photographic materials can exhibit an increase in minimum
> density, a loss in contrast and speed in the toe, and an increase in
> granularity.
> 
> The change in film performance is determined by several factors, such as
> the film speed and length of time exposed to the radiation before the
> film is processed. A film with an Exposure Index (El) of 500 can exhibit
> about three times the change in performance as a film with an El of 125.
> While this effect on a film product isn't immediate, we still suggest
> exposing and processing the film soon after purchase. We recommend a
> period of no more than six months from the time of film purchase before
> exposure and processing, provided it has been kept under specified
> conditions. Films kept for extended periods beyond six months may be
> affected, especially the faster films, even if they have been frozen.
> The only way to determine the specific effect of ambient-background
> radiation is to make actual tests or measurements by placing a detector
> in the location where the film is stored. The most obvious clue is the
> observance of increased granularity, especially in the light areas of
> the scene."
> 
> <http://motion.kodak.com/motion/Support/Technical_Information/Storage/storage_
> info.htm#radiation#ixzz3nNB04BHX>
> 
> 
> 
> On 10/1/15 6:07 PM, Richard Man wrote:
>> Ken, I will take them.Please send paypal/address info.
>> 
>> Thanks
>> 
>> On Thu, Oct 1, 2015 at 10:13 AM, Kenneth Lassiter <kenlass904 at gmail.com>
>> wrote:
>> 
>>> As part of my downsizing, I must remove my stash of film from the freezer.
>>> Thi sfilm was fresh when it was put into the freezer 20 years ago. It
>>> should be perfect when warmed to room temperature.  It has been stored in
>>> the plastic cans inside freezer bags inside a large plastic container and
>>> always in the freezer.
>>> 
>>> Price REDUCED:US$60 for the lot of 115 rolls including shipping in the USA.
>>> 
>>> OR US$0.75/roll plus shipping.
>>> 
>>> *# Rolls*
>>> 
>>> *Film*
>>> 
>>> *135-36 exp*
>>> 
>>> *135-24 exp*
>>> 
>>> 25
>>> 
>>> Ektachrome 200 Daylight
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 26
>>> 
>>> Ektachrome 100 VS
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 15
>>> 
>>> Fuji 100 Daylight slide film
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 7
>>> 
>>> Fuji 400 Provia
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 4
>>> 
>>> Ilford Delta B/W
>>> 
>>> 
>>> 
>>> X
>>> 
>>> 7
>>> 
>>> Kodak Supra 100 Color Neg
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 5
>>> 
>>> T-max 400
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 8
>>> 
>>> Fuji Sensia 200 slidefilm
>>> 
>>> 
>>> 
>>> X
>>> 
>>> 5
>>> 
>>> Kodak Porta 400 NC
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 4
>>> 
>>> Kodacolor Gold 200 Color Neg
>>> 
>>> 
>>> 
>>> X
>>> 
>>> 1
>>> 
>>> Kodak IR Ektachrome Prof
>>> 
>>> X
>>> 
>>> 
>>> 
>>> 3
>>> 
>>> Kodak Max 400 color neg
>>> 
>>> 
>>> 
>>> X
>>> 
>>> 10
>>> 
>>> Misc mixed single rolls
>>> 
>>> X
>>> 
>>> X
>>> 
>>> *115*
>>> 
>>> *Total rolls*
>>> 
>>> 
>>> 
>>> 
>>> 
>>> Ken Lassiter
>>> kenlass904 at gmail.com  OR 561-247-7725
>>> 
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>> 
>> 
>> 
>> 
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information




-- 
Mark William Rabiner
Photographer
http://gallery.leica-users.org/v/lugalrabs/