Is there a trick to determine what type of film you loaded (LF)

Discussion in 'Color: Film, Paper, and Chemistry' started by steveb533, Mar 23, 2013.

  1. steveb533

    steveb533 Member

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    Hi,
    I loaded some large format film a while ago and I cant remember if it is c-41 or b&w...I think it was c-41. Is there any trick to figuring that out, that anyone knows of? Also if I cant determine which, it would make more sense to develop with b&w chemicals I guess? Thanks

    Steve
     
  2. Rudeofus

    Rudeofus Subscriber

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    Do you think you could clip off a tiny corner of the film sheet somewhere in the dark, then reinsert the remaining sheet back into the film holder? The difference between b&w and C41 film stock should be plenty obvious (orange mask!) even before any development has taken place ...
     
  3. Shawn Dougherty

    Shawn Dougherty Member

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    There are notch codes in the upper right hand corner if the film is held vertically with the emulsion towards you. The notches are different for each film. It will be easier to figure out by feel if you can narrow it down to only a couple of possibilities... or you could sacrifice one sheet and look at it in the light.
     
  4. Pinholemaster

    Pinholemaster Member

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    Check the notch code on the film. Basically feel for it to determine the various notch shapes and sequence, the look up the sequence of notches. Then you'll know exactly what film you have.

    If you have the boxes you film came in you'll see the notch code printed on the label.

    http://en.wikipedia.org/wiki/Notch_code
     
  5. Worker 11811

    Worker 11811 Member

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    If you have some sheets of film already developed, check the notch codes on those.

    Practice feeling the notches with your eyes shut. Different notches feel pretty distinct, once you get the hang of it.

    Compare the known to your unknown. (In the dark, of course! :wink: )
     
  6. Bill Burk

    Bill Burk Subscriber

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    And of course, you probably have used the same film before (and have developed sheets to compare notches).

    Or at least you have part of a box of fresh film to compare...
     
  7. bdial

    bdial Subscriber

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    The codes for B&W and color (at least for Kodak films) are pretty different. The code is also illustrated on the box (again, Kodak products, Ilford too, I believe) so you can look at what to expect before turning out the lights.
    As sort of a last resort short of turning on the lights on a sheet, put the sheet over a card or piece of paper and trace the notches with a thin lead pencil, then put the sheet back in the holder.
     
  8. jnanian

    jnanian Advertiser Advertiser

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  9. eddie

    eddie Subscriber

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    I once used Silly Putty to determine what the film was. I just pressed the notches into the Putty, and went to look it up.
     
  10. steveb533

    steveb533 Member

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    Thanks alot for the responses! I didnt know about the different edge markings. I will try that. Thanks again

    Steve