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Thread: I don't understand Rodinol...

  1. #1

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    I don't understand Rodinol...

    When I develop Adox, the pre-dev wash comes out deep blue and the developer comes out red.

    When I develop Agfa Green x-ray, the wash comes out pink and the developer comes out blue.

    The Agfa film is pink before exposure and blue after it's developed...

    I'm sure it's doing it just to annoy me!

    Neil

  2. #2
    Jac@stafford.net's Avatar
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    Re: I don't understand Rodinol...

    This will seem counter-intuitive, but after a post-fixing rinse put it back into any developer, agitate well and wash. The tint left on the film should be gone.

  3. #3
    Tin Can's Avatar
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    Re: I don't understand Rodinol...

    X-Ray film?

    Is different.
    wear mask or NOT

    is ???

  4. #4

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    Re: I don't understand Rodinol...

    tmax - the developer looks like grape rush when you dump it out


    I told my kid I develop film in grape crush and showed he when I dumped it out

    she didn't buy it..but she knew to be wary of what I said by age 3

  5. #5

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    Re: I don't understand Rodinol...

    Quote Originally Posted by DrTang View Post
    tmax - the developer looks like grape rush when you dump it out


    I told my kid I develop film in grape crush and showed he when I dumped it out

    she didn't buy it..but she knew to be wary of what I said by age 3
    I think that's a Kodak thing. The Ektar and portra I have done c-41 all come out with the same color from the presoak.


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    Resident Heretic Bruce Watson's Avatar
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    Re: I don't understand Rodinol...

    Quote Originally Posted by barnacle View Post
    When I develop Adox, the pre-dev wash comes out deep blue and the developer comes out red.

    When I develop Agfa Green x-ray, the wash comes out pink and the developer comes out blue.

    The Agfa film is pink before exposure and blue after it's developed...
    Mostly these are the sensitizing dyes. It's how you turn an orthochromatic emulsion into a panchromatic emulsion.

    If you do a prewash, it will carry a bunch of sensitizing dye with it when you pour it out. And you haven't even started to develop the film yet. When I do this with TMY-2, I get purple. At the end of processing the film is usually slightly purple-pink.

    The color is basically meaningless. If you don't like your film color when you're done, give the film a few minutes in sunlight. The UV will generally kill off the color for you. But it's not necessary. You can print right through it in the darkroom (has no effect on the print). Similarly, you can scan right through it.

    Bruce Watson

  7. #7
    Recovering Leica Addict seezee's Avatar
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    Re: I don't understand Rodinol...

    Quote Originally Posted by Bruce Watson View Post
    The color is basically meaningless. If you don't like your film color when you're done, give the film a few minutes in sunlight. The UV will generally kill off the color for you. But it's not necessary. You can print right through it in the darkroom (has no effect on the print). Similarly, you can scan right through it.
    So it doesn't affect variable contrast paper?
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    Re: I don't understand Rodinol...

    Quote Originally Posted by Bruce Watson View Post
    Mostly these are the sensitizing dyes. It's how you turn an orthochromatic emulsion into a panchromatic emulsion.

    If you do a prewash, it will carry a bunch of sensitizing dye with it when you pour it out. And you haven't even started to develop the film yet. When I do this with TMY-2, I get purple. At the end of processing the film is usually slightly purple-pink.

    The color is basically meaningless. If you don't like your film color when you're done, give the film a few minutes in sunlight. The UV will generally kill off the color for you. But it's not necessary. You can print right through it in the darkroom (has no effect on the print). Similarly, you can scan right through it.
    More likely the anti-halation backing in the pre-wash, and possibly that plus some sensitizing dye in the developer and afterward.

  9. #9

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    Re: I don't understand Rodinol...

    The blue from Adox wash is the anti-halation layer; I've seen it still there on odd occasions when I've had a film stick to the bottom of the tray.
    The blue on the x-ray looks to be part of the film substrate; it's constant irrespective of development times etc, completely uniform. Though no problem to scan through.
    And I suspect that Bruce is right regarding sensitizing dyes; no reason for them to be the same colour between films or even at different stages in processing. The x-ray film is of course coated on both sides, so you can't see the substrate without removing some emulsion.

    Neil

  10. #10
    Recovering Leica Addict seezee's Avatar
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    Re: I don't understand Rodinol...

    Quote Originally Posted by barnacle View Post
    The blue on the x-ray looks to be part of the film substrate; it's constant irrespective of development times etc, completely uniform.
    All x-ray film, AFAIK, is on a blue polyester substrate.
    "Never try to teach a pig to sing. It wastes your time and annoys the pig."

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