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Thread: Use of X-ray film: technical discussion with example images

  1. #5071

    Join Date
    Apr 2014
    Location
    Central PA
    Posts
    482

    Re: Use of X-ray film: technical discussion with example images

    I had similar issues with a batch of Ektascan I bought 3-5 years ago. I think it’s a quality control issue. It’s still a great film to learn with. As a former chemist, Pyrocat HD, uses sodium or potassium carbonate to get pH high enough for development. Acid stop bath would be more likely than plain water stop bath to create issues in terms of converting the carbonate to carbon dioxide gas and little bubbles. But, I really doubt that’s a real issue. And I really doubt that’s at the root of the issue.

    Please post a review of the camera, I saw that and really wanted one! I’m wondering if it’s as nice as the ads.

  2. #5072

    Join Date
    May 2016
    Location
    Manchester , England
    Posts
    14

    Re: Use of X-ray film: technical discussion with example images

    Quote Originally Posted by andrewch59 View Post
    Doesn't dust normally show up as white specks?
    On a negative they would do , as no light got past the bits to leave an exposure .

    The sample posted is a scan of the negative then inverted to a positive .
    So the white dots on the negative are now black dots on the scan/print .

    There's a lot of it to be dust though , so possibly a fault in the emulsion .

  3. #5073

    Join Date
    Aug 2014
    Location
    London
    Posts
    22

    Re: Use of X-ray film: technical discussion with example images

    I was wondering if it was from the development. I am using a Paterson Orbital unit but Agfa double-sided processed the same, which I thought would be more problematical came out fine and so too sheets of FP4. Here is magnified clip from a different sheet, not just little spots but also broader marks. It does seem to be emulsion related and is not like handling scratches.

    Click image for larger version. 

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