if Ektachrome can do it, HP5+ can
I suspect Kodak films from 50 years ago were probably more resilient than current HP5. HP5 already fogs pretty quickly with age.
Anyway, I have 2 inches of it in a cassette in an old Kodak aluminum film can in the cupholder in my van. I'll develop it this evening with the similar piece sitting in a film cassette in the darkroom.
Your test is about as valid as Franks and my statements. Experiments need to be repeatable and there are too many variables in your test.
If you are human then lack of air tended to be the problem with old cars unless Jimmy Cagney was close. Then if you were worried about air and said so, Jimmy gave you air by making some holes in the boot with a revolver. Nice of him, I thought, as he didn't even particularly like the man in the boot.I realise cars vary, but I've always found that the boot/trunk is cooler than the cabin as it has no windows.
Anyway, I have 2 inches of it in a cassette in an old Kodak aluminum film can in the cupholder in my van. I'll develop it this evening with the similar piece sitting in a film cassette in the darkroom.
Variables? Tell them to me. Two pieces of film cut from the same bulk roll, put in light-tight containers at the same time, put in two different environments for the same amount of time, developed on the same reel at the same time. Where are these "variables" you're talking about?
Anyway, I have 2 inches of it in a cassette in an old Kodak aluminum film can in the cupholder in my van. I'll develop it this evening with the similar piece sitting in a film cassette in the darkroom.
Are you trying to determine the effects of film sitting in a car or the effects of temperature on film?
If you’re testing heat effects on film you would want to know what temp the film was at and how long it was at that temp. if you started the test when the car was cool, how long it took to get to test temp. Is the car parked in shade. Did it get any shade during the test. Any clouds in the sky? All of this is going to effect the inside temp of the car and make duplicating the test impossible.
I expect no ill effect from one day
I realise cars vary, but I've always found that the boot/trunk is cooler than the cabin as it has no windows. I cannot see how a few hours or even a few days in a hot car would do what OP describes. There's something else afoot.
It should be obvious that this is a non-stringent quick test to see if sitting in a car in sunlight on a hot day, for about 8 hours or so, will have an visible impact on the base fog of hp5. I could load each strip into a camera before I develop and take a test exposure - and I may, if I feel like it.
This forum is overrun by people looking for reasons to do nothing. Well, this will generate a result. My test may not be suitable for getting a sophisticated data set but it will tell you a plain "yes" or "no" and give an idea of severity. In other words, it will answer the question, "Is it ok to leave my film in a car all day long on a hot day?"
Don, it sounds like a reasonable attempt to carry out a test to me. Yes your conditions might be different from other conditions but a broad brush answer is at least an indication of what might happen or not happen
pentaxuser
Film is a product that is literally designed to sit in non climate controlled conditions for several years and perform as if it just left the factory.
Top strip is the one that was in the van from yesterday morning until this morning, through a very hot day.
Bottom strip was in the darkroom.
Both exposures identical, made this morning. Strips developed together in stock D76.
I can't see any impact the heat had, except the strip that was in the car was more-tightly coiled when I put it on the reel.
View attachment 348315
Top strip is the one that was in the van from yesterday morning until this morning, through a very hot day.
Bottom strip was in the darkroom.
Both exposures identical, made this morning. Strips developed together in stock D76.
I can't see any impact the heat had, except the strip that was in the car was more-tightly coiled when I put it on the reel.
View attachment 348315
With my white car, the trunk is the coolest place on hot days. The car windows turn the car into a greenhouse; heat can't escape, so the interior of the car is always hotter than the trunk, which has a nice reflective lid and no windows.Even so the trunk and glove box get even hotter.
If the film has been exposed get it processed asap because exposure triggers image degradation
That could be a useful second experiment - see if there's an impact on an exposed image. I could do that, also. That could explain what happened to your images, @logan2z.
But as to how to quantify that vulnerability.....?
I must have misunderstood your original experiment, that's what I thought you did.
No - I just wanted to see if heat would make fog -- and then I wanted to see if it would impact the sensitivity.
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