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I recently came across these, and bought some to experiment.

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Photos courtesy of the seller

All the can reads is

"GAF Corporation. Open in total darkness. Recording Type 2005."

Unfortunately the internet doesn't seem to have much on this - I'd love to know what ISO, color or type of film it is before shooting it.

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    This resource: ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7227224 at least groups a couple of their film offerings for an expo. Its order appears to go: specialty, color slide, "recording film". That probably narrows it down to color negative or black and white. They used C-22 back then, so there's that as well. – Hueco Oct 19 '18 at 20:10
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    If you've got a bunch, it'd be best to burn a roll shooting a constant object at varying ISO's from, probably 12 on up (12,25,50,100). Include half stops if you like. Develop as black and white and see how it goes. – Hueco Oct 19 '18 at 20:15
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Black & White Super Hypan 500 ISO Quite outdated - Why bother using - maybe best to send to a museum. GAF (General Aniline & Film) Binghamton NY. Emerged from bankruptcy now making roofing supplies.

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    "Why bother using" because it's fun to try new things! 🙂 I like expressing my vision in different chemical types... this will definitely be the first time I use 500 iso! Not very common – MicroMachine Oct 19 '18 at 20:35
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    Hi Alan. Where did you get this information that GAF Recording Film Type 2005 = Black & White Super Hypan 500 ISO? – osullic Oct 19 '18 at 22:18
  • Doesn't tell me what process it uses... – MicroMachine Nov 26 '18 at 22:19
  • @MicroMachine the process is for B&W negative film as Alan mentioned. You'll never know what the actual ISO is now after it has aged. Figure that a more practical index would be somewhere between 100 and 250. As well, unless you have a supply of this stock, your experiments will not be applicable to other more recent material. Expect some fogging in the end of the roll nearest the opening. – Stan Dec 7 '18 at 2:08

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