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Does exposed film weigh more than unexposed film?


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#1 Dan Salzmann

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Posted 03 June 2005 - 04:04 AM

Does exposed film weigh more than unexposed film?
Does developed film weigh more than undeveloped film?
That's to say, do the chemical reactions that take place add weight to the filmstock?
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#2 John Pytlak RIP

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Posted 03 June 2005 - 05:34 AM

Does exposed film weigh more than unexposed film?
Does developed film weigh more than undeveloped film?
That's to say, do the chemical reactions that take place add weight to the filmstock?

<{POST_SNAPBACK}>


How much does a photon weigh? ;)

I've never seen data on this, but I assume more things (rem-jet, soluble absorber dyes, silver halide, etc.) are washed out/off of the film during processing than any added molecular weight of the dyes formed by reaction of couplers with oxidized developer. So I suspect that processed film weighs less than raw stock.
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#3 Robert Morein

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Posted 03 June 2005 - 05:36 AM

Does exposed film weigh more than unexposed film?
Does developed film weigh more than undeveloped film?
That's to say, do the chemical reactions that take place add weight to the filmstock?

<{POST_SNAPBACK}>

Exposed film weighs no more than unexposed film.
The loss or gain in energy, which equates to mass, is miniscule, not measurable.
On the other hand, I would expect developed film to weigh less than undeveloped film, because the silver has been removed, and the antihalation backing stripped off.
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#4 Dominic Case

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Posted 03 June 2005 - 05:12 PM

Does exposed film weigh more than unexposed film?


Well, only very slightly - after all, what it's captured is only light. :rolleyes:
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#5 Robert Hughes

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Posted 04 June 2005 - 01:11 AM

So I assume overexposed film will be lighter still - unless it's negative...
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#6 Dominic Case

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Posted 04 June 2005 - 06:00 PM

So I assume overexposed film will be lighter still

Not really, because over-exposure leads to a heavier negative, with more density. :lol:
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#7 John Thomas

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Posted 04 June 2005 - 10:20 PM

I've found that poorly exposed film can weigh on you heavily.
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#8 Rich Steel

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Posted 05 June 2005 - 04:10 PM

Developed film definetly weighs more especially if you use HEAVY WATER in the chemicals....
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