[LargeFormat] Keeping Film Cool (was Re: A new departure)

[john frost]

Part of your proposed project has been done. The PHOTO TECHNIQUES
magazine for MAY/JUNE 2001 has an article pertaining to heat damage to
B&W and color negative and reversal films.

The test ran to 40 (forty) days at 110F (Fahrenheit). Looking at the
results, some films pick up density and some lose density. This may be
useful for zone system workers using color materials!

I would be interested in your test results going to 150F. I wonder if
there is a smelter in the area that would let us store film above their
furnaces for six months or so....

john (:>)

Brock Nanson wrote:
> 
> I think it would be interesting to test the heat effects and try to quantify
> the damage.  Where I live, the summer temperatures approach 40 Celsius.
> Where I holiday, the temperatures can get that high as well (usually
> Queensland).  I don't leave the film in the passenger compartment... the
> glass gets the greenhouse effect going in a big way as you say!  I use the
> trunk... much cooler, even if the paint is dark (the amount of temperature
> rise in a dark car is not that much more than a lighter car - it's the glass
> that counts!) and leave the film in the camera bag which is a fairly good
> insulator too I've found.  If I'm not shooting black and white, it's Velvia
> and I've never had an issue with unexpected colours!  Perhaps in a lab
> setting with cold samples and warm samples there might be a difference
> detected, but after adding polarizers, warming filters, etc, it's hard to
> look at the result and say 'crap, I should have kept the film cold!'.
> Colour temperature of the sun at different times of the day... sunsets...
> hard to quantify.
> 
> A lab test would be interesting to try...!
> 
> Hot Mountain Dew... that's a thought I don't like to contemplate!!!  It's
> bad enough cold!!
> 
> Brock
> 
> ----- Original Message -----
> From: "Clive Warren" <Clive.Warren@megacycle.co.uk>
> To: <largeformat@f32.net>
> Sent: Friday, March 08, 2002 3:30 AM
> Subject: [LargeFormat] Keeping Film Cool (was Re: A new departure)
> 
> | At 20:20 07/03/02 -0800, Brock Nanson wrote:
> | >I also used to keep the film refrigerated wherever possible during a
> trip.
> | >I've become less anal about that too...  It takes a prolonged high
> | >temperature to do damage you can see, so unless colour rendition is an
> | >absolute must for product photography for instance, you won't be able to
> see
> | >the difference in the red sunset or the subtle change in the green of the
> | >trees.
> |
> | It's amazing the extremes of temperature that film will tolerate - unless
> | it's something like 4x5 trannie film that is......  The temperatures in
> the
> | hire cars I use in the US on my various trips can be so extreme that it is
> | not possible to get into the car unless you want to get burned by the
> seats
> | and challenge your respiratory system!  Strategy is to open the door wide,
> | insert ignition key from outside the car and fire it up with the AC on
> | full.  These temperatures are despite having huge reflective sun shades in
> | the front and rear windows.....
> |
> | After about five or ten minutes you can use the car - if your trannie film
> | is not in a cooler bag it'll be roasted!  This probably comes into the
> | realm of prolonged high temperatures :-)
> |
> | When backpacking (for me this means moving more than ten feet from the
> car)
> | then I only take out with me as many holders as I think will be needed for
> | the area and leave the rest in the cooler bag together with the exposed
> and
> | unexposed film.
> |
> | Oh yes, drinking by accident the ubiquitous US travelling drink, Mountain
> | dew,  at the temperature of a hot cup of English tea requires a half hour
> | recovery period ;-)
> |
> | Cheers,
> |              Clive
> 
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