how much 16mm can I process with a bag of d-76 and fixer?

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slashmaster
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how much 16mm can I process with a bag of d-76 and fixer?

Post by slashmaster » Sat Feb 27, 2016 11:15 pm

I got a bag of d-76 and kodak fixer. My question is, how many 100 foot rolls of 16mm can I process with it? Will the developer go bad first or the fixer? Also, will the developer last longer if I overexpose the film a little so it can spend less time in the developer?

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Re: how much 16mm can I process with a bag of d-76 and fixer

Post by Mana » Sun Feb 28, 2016 9:08 pm

I guess you could mix the D76 as 1:1 to save on chemicals and just develop for longer times. 36 frames of 35mm is about 6 feet of film, times that by two and maybe you can come up with an estimation based on that.
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Re: how much 16mm can I process with a bag of d-76 and fixer

Post by richard p. t. » Wed Mar 09, 2016 5:09 am

You didn't say what size bag of D76 you have.
Lets say it was one gallon. I would divide that into two halves. Each half I would do 2 x 100' rolls. So 4 rolls for the gallon bag. I would add 30 seconds to the second roll. It is certainly possible to develop images on a third roll, but they will be thinner than the first and second.
The fixer will last longer than the developer. But it is easy to test the fixer - just dunk in some film and see how long it takes to clear. If it takes more than say 2 minutes, junk it.
I don't think changing the exposure and development times will do anything for you. Assuming the end result you want is to get appropriately dense negative images, the same density would mean the same amount of 'reductcion' of silver halide to Silver and liberated Bromide/Iodide. It is the latter that reduces the efficacy of developer (as well as oxidisation). Storing the dev in the fridge helps a lot.
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Re: how much 16mm can I process with a bag of d-76 and fixer

Post by slashmaster » Thu Mar 10, 2016 3:10 am

richard p. t. wrote:You didn't say what size bag of D76 you have.
Lets say it was one gallon. I would divide that into two halves. Each half I would do 2 x 100' rolls. So 4 rolls for the gallon bag. I would add 30 seconds to the second roll. It is certainly possible to develop images on a third roll, but they will be thinner than the first and second.
The fixer will last longer than the developer. But it is easy to test the fixer - just dunk in some film and see how long it takes to clear. If it takes more than say 2 minutes, junk it.
I don't think changing the exposure and development times will do anything for you. Assuming the end result you want is to get appropriately dense negative images, the same density would mean the same amount of 'reductcion' of silver halide to Silver and liberated Bromide/Iodide. It is the latter that reduces the efficacy of developer (as well as oxidisation). Storing the dev in the fridge helps a lot.
rt
Thanks Richard! Yes, it's the gallon bag. I'm going to try this later!

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Re: how much 16mm can I process with a bag of d-76 and fixer

Post by slashmaster » Thu Mar 10, 2016 3:16 am

Mana wrote:I guess you could mix the D76 as 1:1 to save on chemicals and just develop for longer times. 36 frames of 35mm is about 6 feet of film, times that by two and maybe you can come up with an estimation based on that.
Thanks Mana. So about 2 35mm 36 exposuse rolls are equivalent of a super 8 cartridge and 8 36 exposure rolls is equivalent of a 100 foot 16mm.

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