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Thread: Help: How to convert a negative to positive to print as a "negative print"

  1. #11

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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Make a lowish contrast, but dodged and burned, paper (RC glossy) print having the eventual size required - but make it with the neg 'upside-down'. Use the wrong-way-round paper inter-positive to make a contact-print on non-textured paper as the final result. Much quicker, cheaper and simpler than using ortho-film and so on when that isn't really essential for the final result (ie. no masking needed).

  2. #12
    Drew Wiley
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    I prefer FP4 for this kind of work. But you'll need to waste a sheet of film first as a test strip relative to exposure time. A good contact printing frame helps. If you have to flip the final interpositive in your enlarger easel, no problem. Sheet film will still look sharp.

  3. #13
    Drew Wiley
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Oops - what I just said might be misinterpreted. You expose the negs emulsion to emulsion, but then if necessary correct the orientation by flipping it in the enlarger neg carrier (not easel).

  4. #14

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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Quote Originally Posted by robert taylor View Post
    Hello all. I need your help. After 40 years of "regular" printing, I finally have need to print a subject as a negative, as Paul Caponigro and others have done.
    You can simply perform a reversal development with paper in the same way BW slides are obtained.

    This is expose and develop, stop bath, bleach to remove metallic silver, open lights to expose remaining silver halide, develop again (until completion if well adjusted, or less), stop bath again and fix.

    You can use an stouffer density wedge to calibrate the process with different paper contrast grades, so you can nail a result at the first time, as reversal development is longer it is nice to have the thing calibrated

    https://www.photrio.com/forum/thread...e-paper.44354/

    It is also performed if using paper as a "negative" but wanting a positive image in the paper:

    https://www.youtube.com/watch?v=50YgsRDYjL0

    If you use dichromate remember contact has to be avoided. For disposing mix it with used developer, liquid will change from orange to dark green, being a way more safe stuff.

  5. #15
    Randy Moe's Avatar
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Not so simple and the bleach is bad news. I have done reversal ULF film.

    An FP4 interneg as I have used and Drew recommended is way faster and cleaner.

    If a print is the desired outcome. Which it is in this case.



    Quote Originally Posted by Pere Casals View Post
    You can simply perform a reversal development with paper in the same way BW slides are obtained.

    This is expose and develop, stop bath, bleach to remove metallic silver, open lights to expose remaining silver halide, develop again (until completion if well adjusted, or less), stop bath again and fix.

    You can use an stouffer density wedge to calibrate the process with different paper contrast grades, so you can nail a result at the first time, as reversal development is longer it is nice to have the thing calibrated

    https://www.photrio.com/forum/thread...e-paper.44354/

    It is also performed if using paper as a "negative" but wanting a positive image in the paper:

    https://www.youtube.com/watch?v=50YgsRDYjL0

    If you use dichromate remember contact has to be avoided. For disposing mix it with used developer, liquid will change from orange to dark green, being a way more safe stuff.

  6. #16
    Nodda Duma's Avatar
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    Help: How to convert a negative to positive to print as a "negative print"

    Take a photo of the negative on a lightbox and enlarge that. Or strip test when you do a contact "print" onto a negative. Print paper is roughly ISO five or so, so your exposure time will be reduced by the ratio of your film speed to paper speed (20x for ISO 100 film)
    Newly made large format dry plates available! Look:
    https://www.etsy.com/shop/Pictoriographica
    .. because my wife is happy when I can cover my photography expenses!

  7. #17
    Randy Moe's Avatar
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Quote Originally Posted by Nodda Duma View Post
    Take a photo of the negative on a lightbox and enlarge that
    That's an inter neg!

  8. #18
    Nodda Duma's Avatar
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Quote Originally Posted by Randy Moe View Post
    That's an inter neg!
    What is that cheating?
    Newly made large format dry plates available! Look:
    https://www.etsy.com/shop/Pictoriographica
    .. because my wife is happy when I can cover my photography expenses!

  9. #19
    Randy Moe's Avatar
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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Quote Originally Posted by Nodda Duma View Post
    What is that cheating?
    No of course not. But it's still an inter neg. I think reversal has an issue with the bleach.

    Why use poison when there are cleaner methods?

  10. #20

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    Re: Help: How to convert a negative to positive to print as a "negative print"

    Quote Originally Posted by Randy Moe View Post
    No of course not. But it's still an inter neg. I think reversal has an issue with the bleach.

    Why use poison when there are cleaner methods?
    Then do it in photoshop, no poison involved! (In your house at least )

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