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Thread: Blotchy pattern on 4x5 negatives

  1. #21

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    Re: Blotchy pattern on 4x5 negatives

    Wasn't it also Toyo who had stinky sheet film holders about a year ago?

    If so, something is seriously wrong with their Quality Control Department!

  2. #22

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    Re: Blotchy pattern on 4x5 negatives

    Condensation during exposure?

  3. #23
    Christopher Barrett's Avatar
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    Re: Blotchy pattern on 4x5 negatives

    Here's my example... maybe we should start a "Post your blotchy negs." thread?


  4. #24
    Unwitting Thread Killer Ari's Avatar
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    Re: Blotchy pattern on 4x5 negatives

    I've never heard of this happening with Toyo holders, nor have I experienced the blotchy fogging, and I've owned dozens of them in 4x5 and 8x10 sizes.
    I never took any precautions because...well…they're film holders.
    I did have smelly 8x10 Toyo film holders, but I got rid of the smell using cat litter and cedar chips.

  5. #25

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    Re: Blotchy pattern on 4x5 negatives

    Quote Originally Posted by Ari View Post
    I've never heard of this happening with Toyo holders, nor have I experienced the blotchy fogging, and I've owned dozens of them in 4x5 and 8x10 sizes.
    I never took any precautions because...well…they're film holders.
    I did have smelly 8x10 Toyo film holders, but I got rid of the smell using cat litter and cedar chips.
    So now they smell like clay in a cedar closet?

  6. #26
    Unwitting Thread Killer Ari's Avatar
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    Re: Blotchy pattern on 4x5 negatives

    Quote Originally Posted by Bob Salomon View Post
    So now they smell like clay in a cedar closet?
    No, now they smell like…victory.

  7. #27

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    Re: Blotchy pattern on 4x5 negatives

    Quote Originally Posted by Ari View Post
    ...
    I did have smelly 8x10 Toyo film holders, but I got rid of the smell using cat litter and cedar chips.
    ...
    Would you care to say what steps you took?

    Thanks,
    Terry

  8. #28

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    Re: Blotchy pattern on 4x5 negatives

    Here's (one of) mineClick image for larger version. 

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  9. #29

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    Re: Blotchy pattern on 4x5 negatives

    So I did a test to try and isolate the problem, and as it turns out, the Toyo dark slides are definitely not opaque, and sunlight will definitely pass through them, as Christopher Barrett suggested (thanks for the tip).

    I decided to expose 6 sheets of film within closed film holders to direct noontime sun (about 7500 foot-candles by my meter) at various durations to see if the light would get through the dark slide. I used 3 of my new Toyo film holders that I had loaded with Tri-X about a month ago. I cut the numbers 1-6 out of blackwrap (a thick black light-tight foil used in film and TV lighting) and taped them to the outside of the dark slides so that I could identify which sheet I was looking at. I also taped a larger patch of blackwrap below the number, to give me a control so I could see if there was any density on the negative prior to the test exposure (from some previous possible light contamination within the last month while it was in the holder).

    I wrapped the holders in blackwrap sleeves, took them outside, then unwrapped the sleeves one at a time and exposed each sheet. #1 was 15 seconds, #2 30 seconds, #3 one minute, #4 two minutes, #5 five minutes, and #6 ten minutes. The effect showed up strongly even at 15 seconds (I've attached a picture of the #1 negative).

    It makes me want to do another test with even shorter exposures to try and see if any exposure to sunlight is safe. I think when I do it I'll only load one side of the holders with film in case the exposure on the "B" side is somehow affecting the film on the "A" side.

    If any amount of direct sun gives this effect then I would think I'd have to take pretty serious precautions when doing daytime exterior shoots.

    Click image for larger version. 

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    Last edited by marmot; 1-Jul-2016 at 19:48.

  10. #30

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    Re: Blotchy pattern on 4x5 negatives

    That hardly deserves the description of 'dark slide'.

    Neil

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