70mm film Value?

It will most likely work, unless it has previously been exposed to light.
Its quality may very well be sub-par, compared to new, properly stored film.

MattKing said:

It will most likely work, unless it has previously been exposed to light.
Its quality may very well be sub-par, compared to new, properly stored film.

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Hope so! each of the packages are unopened, the box, within that, the metal tin, and then within that, a black plastic bag. Again, not stored in a freezer but was stored in a warehouse where the temperature was likely kept in the 70's all the time. Just a guess though. Maybe I can get a few rolls sold and get some feedback from a photographer.

LInuxHack3r said:

I'd love to hear from others whether this film would be usable or not. I've already sold a single roll of it on Ebay this morning for $88.00. I am conflicted, on one hand I very specifically have shown that the film is expired. If someone buys it and it doesn't work, who is at fault? I cannot guarantee it but if someone wants to buy and try it, even knowing that it is expired, that doesn't seem like my fault. I'm sure a buyer on Ebay though would want their money back, wouldn't they?

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Yes it is usable. In case of doubt you may use this film with tape and cutting in sheed film holders.
But it might be impossible to sell 150 rolls of it. IF someone would become upset on ebay it might not come from less correct characteristic caused from expiration date (this effect should be smal) but someone may realize later (after buying) that it is no bw film.
So I would mark your offer quite clear (with big notes) C 41 process only !!

with regards

PS : 10 years expiration date is (to me I should add) a different issue if you have
real bw. Color films without good storage and within the mentioned age are highly priced on ebay. But on ebay are sometimes a lot of things highly priced...

PPS : From less demand to such films you may be right - it might be the same with
brand new 70mm PORTRA bw.

https://www.photrio.com/forum/threads/70mm-x-100-rolls-c-41-kodak-konica-afga.156835/#post-2035355

Added ~2 more types of film, Konica and AFGA.

Simple followup question. Does either of the films (Kodak 70mm BW400 C-41 or Kodak 70mm 160NC C-41) have silver content in it? I've heard that traditionally black and white film does, but does the C-41 version of black and white contain any?

In pure pounds (absolute film weight, no containers, spools, etc) I have the following:

70mm BW400: 31.25 lbs
70mm 160NC: 12.25 lbs

I have contacted some people regarding this, but they all charge minimum processing fees and I'd have to ship it to them. Without more information, I'm not sure it's worth the risk for them to tell me there is little/no silver in this film.

I've read some about extracting the silver at home. Seems electrolysis is a method used, but there seems to be additional steps. Some say dipping the film in bleach and then using electrolysis in the solution, others say to burn the film and use electrolysis with the ash submerged in a solution. Thoughts?

And for those concerned, no, this isn't the film I am/was selling. This is all "wasted" that was not developed. It is either extract silver from it or trash it, likely.

LInuxHack3r said:

Simple followup question. Does either of the films (Kodak 70mm BW400 C-41 or Kodak 70mm 160NC C-41) have silver content in it? I've heard that traditionally black and white film does, but does the C-41 version of black and white contain any?

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Yep, all of these films have silver. A difference between conventional b&w vs C-41 films is that in C-41 process, all of the silver is (ideally) removed in the processing; the final image is made up of dyes. Whereas with conventional b&w film the final image is made of silver; only the non-image silver is dissolved out in the fixing solution.

Some traditional ways of recovering silver from unprocessed film have been mainly to either incinerate it or run it through fixer, and then recover the silver from the fixer (via electroplate or some sort of chemical means). There's potential environmental issues with either of these for someone who doesn't know what they're doing. Then once you have the ash or silver flake, you still have to deal with a refiner. There will be, as you say, refining and assay fees, etc. Personally, I think you're probably better off to sell the film to someone who already does this sort of work, realizing that you'll get a pretty low proportion of the final silver value. You would need to have a tremendous amount of film to have any bargaining power here.

If you already had some automated processing and electroplating equipment, plus free time on your hands, it might be worth dealing with the film.

Some folks at RFF are drooling over 70mm film. They are using it in Hassleblads and else.

A long time ago when the earth had many boxes coloured Yellow, Kodak did have a chart with average amounts of recoverable silver in scrap film somewhere on their web site. Unprocessed colour film does have silver in it, teh silver is left at the lab when it is procesed.

It will all sell on eBay if the price is right...and it will be fine for use by hobbyists and artists. There are actually people who specifically seek out expired film stock....If you really want to see what it is worth, list a few rolls of various types and start the auction at $0.99. Offer to ship at actual cost...post good photos of the product. Given time, much of it will sell. I bet even now, there are folks hunting down the old 70mm long roll backs for their medium format SLRs.

I'm actually thinking it would be fun to play with in home made pin hole cameras....

How do you process 70mm? I have what appears to be a 70mm film holder, like old spiral ones used for an old Stainless Steel Omega tank, only it's about 18" across, so it won't fit in any development tank that I've seen. I also have what appears to be a few rolls of Kodak HIE in 70mm. I need to load up a snippet and see if it's even worth using, but the development question has plagued me. Would I do it in a bucket in the dark?

I have a humungeous 70mm thread ongoing over on www.rangefinderforums.com. Search "70mm FUN"
Look the thread over. There are lots of ways to process 70mm film