Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,540   Posts: 1,544,355   Online: 1065
      
Results 1 to 6 of 6
  1. #1

    Join Date
    Jan 2007
    Shooter
    Large Format
    Posts
    284

    Colored pinholes in my slides

    I just developed a few more E-6 rolls. This time I used a 4 reel tank and 500ml of solution. Previously I was using a 2 reel tank and 350ml. Film was Provia 400X

    The slides came out great except almost all of the photos had at least one tiny colored pinhole in them. When viewed with my 8x loupe, I could see the tiny purple (M+C?) or green (C+Y?) dots.

    Any idea on what is causing them? How do I make sure it doesn't happen again? Thanks.

  2. #2
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,022
    Images
    65
    When you have a white or black pinhole on E6 slides it indicates a problem in either the color or first developer, but when you have colored pinholes it can indicate a coating defect. One of the layers is missing.

    The reason I san "can" is that you might have a transient air bubble in either developer, and when it bursts it then allows partial development.

    Did you give it a good presoak?

    PE

  3. #3

    Join Date
    Jan 2007
    Shooter
    Large Format
    Posts
    284
    Yes, the film had a 3 minute presoak as per your previous advice. Coating defects are not good. Do you think this kind of thing would make it past Fuji QC?

    I am using continuous agitation. I don't think it is an air bubble. Hmmm....

  4. #4
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,022
    Images
    65
    Usually, a bubble defect in color film results in a "," or comma defect or a double comma with a tail up and down. So, no I don't really believe it is a normal defect. It probably would not get by Fuji inspection, but this is not unknown to happen at Fuji or Kodak. I merely mention it.

    It looks somehow like a process problem more than a coating defect, but if you see the comma shape or comet shape, then it is a coating defect. If it is round, then it must be air bubbles somehow reforming on the coating.

    PE

  5. #5

    Join Date
    Jan 2007
    Shooter
    Large Format
    Posts
    284
    Here are two scans attached. Both are scanned at 2400DPI and shown at actual pixels (100%).

    The defects don't look comma shaped. Any other ideas on the cause or how to mitigate it?

    Thanks!
    Attached Thumbnails Attached Thumbnails defect1.jpg   defect2.jpg  

  6. #6
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,022
    Images
    65
    That is not a "comet" or a DEC "double ended comet" defect found in some coatings.

    It might be a bubble in the coating or in the process. If in the coating, you can probably see a tiny depression or relief image of the defect by incident light. That will prove it is a coating defect, but if it is not there it will prove nothing either way.

    PE



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin