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  1. #11
    Photo Engineer's Avatar
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    Quote Originally Posted by Q.G. View Post
    No.
    Too bad. I thought you knew this kind of stuff based on previous posts.

    PE

  2. #12

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    Quote Originally Posted by Photo Engineer View Post
    Too bad. I thought you knew this kind of stuff based on previous posts.

    PE
    Deranging again... but what previous posts may have given you that idea?
    If you would point them out, i would be happy to explain them to you.

  3. #13
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    No, just your broad ranging knowledge on photomaterials, color and photography gave me the idea that you may have some thoughts on this matter. That is all. I have no evidence either way except your posts.

    PE

  4. #14

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    Congratulations! Keep up the good work, I would offer to help you, but I have no clue after basic chemistry.
    "Would you like it if someone that painted in oils told you that you were not making portraits because you were using a camera?"
    "Shouldn't it be more about the joy of producing and viewing the photo than what you paid for the camera?"

    Me

  5. #15

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    Quote Originally Posted by Photo Engineer View Post
    I asked a Sirius question of you. Any suggestions?

    PE
    "Sirius" - that's a good one!

    I have a sirius question:

    When do the "dog days of summer" end?

    Or, a less technical sirius question:

    Will Sirius go broke like MX Radio, or can Howard Stern keep it solvent?

    (Ha - I worked it back to chemistry, sort of...)
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  6. #16
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    I need a solution to my problem of the dye being too soluble. I thought alum would work, but it did not. I guess I have to try calcium next.

    PE

  7. #17
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    Don't laugh

    Well, it looked better wet!

    Here is the image that I got of the Stouffer step wedge. After scanning in the image I could clearly see both a negative yellow brown image and a positive dye image. I tried treating the brown area today and could do nothing to remove it.

    The blemishes are due to the acid causing the gelatin to swell in a bubble and then burst. The spots appear to be due to dye washing out or being retained in some of the areas.

    I can play with this in PS and get just about any enhancement to show more detail, better color, or even the dual neg-pos images, but this is the raw data.

    As the title says, "don't laugh". Because then I would ask you to try it and see how you did on your first attempt!

    PE
    Attached Thumbnails Attached Thumbnails Azo 1.jpg  

  8. #18
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    Quote Originally Posted by Photo Engineer View Post
    Well, it looked better wet!

    Here is the image that I got of the Stouffer step wedge. After scanning in the image I could clearly see both a negative yellow brown image and a positive dye image. I tried treating the brown area today and could do nothing to remove it.

    The blemishes are due to the acid causing the gelatin to swell in a bubble and then burst. The spots appear to be due to dye washing out or being retained in some of the areas.

    I can play with this in PS and get just about any enhancement to show more detail, better color, or even the dual neg-pos images, but this is the raw data.

    As the title says, "don't laugh". Because then I would ask you to try it and see how you did on your first attempt!

    PE
    Oops! Perhaps it isn't considered a successful photograph, but it is an interesting abstract/psychedelic piece of art in my eyes.

    I guess that if some one like you (former photo engineer and worked with color) gets that results,; I can't imagine me, who hasn't got more than the most basic chemistry knowledge.

    Just curious, Is the process some kind of dye transfer or dye bleach?

    I wish you success in future color coatings.

  9. #19
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    Similar coating done at EK

    Here is a similar coating to the one shown in my first example.

    I coated this by machine and it was one of the first Dye Bleach coatings I ever did. The process was close to what I used above. However, this machine coating was the result of a lot of experimentation using hand coatings to get the balance of silver and dye correct, and experiments to bind the dye in place.

    Even so, this early example shows flaws.

    PE
    Attached Thumbnails Attached Thumbnails Azo machine coated.jpg  

  10. #20
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    This is a complete dye bleach process from start to finish, quite similar to that used by Ilfochrome.

    PE

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