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  1. #1
    Mustafa Umut Sarac's Avatar
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    Autochrome 4x5 Polaroid Paper, Filter / BW and Color Print Idea

    Bob Crowley tries to make an P/N 55 Polaroid generic film for couple of years. I decided to look in to wiki about that film and I learned that developer inserted between film and paper.

    Bob do all without machines and by hand and I thought his method could be developed even further.

    Here is the idea for color autochrome polaroid film.

    Transparent film can be dotted with 6 different color chemicals with 6 color inkjet printer.

    Some of the original dyes of autochrome is widely available and used at food coloring industry and some of other expensive ones could be changed by cheaper ones.

    In 30 seconds , your filter is ready.

    Only we have to do is buy 4x5 Ilford positive paper and place in the cartouche face to face.
    After exposure done , insert spreads the dk 50 developer on to positive paper and

    1- your bw print is ready

    2- your autochrome is ready after registering the filter to paper.

    Mustafa Umut Sarac

    Istanbul

  2. #2
    holmburgers's Avatar
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    A fantastic idea, but one problem. You cannot use paper, you need to use a transparent film. Additive color will not work on a reflective surface, it has to be a slide.

    But, an instant slide sounds pretty awesome to me.
    If you are the big tree, we are the small axe

  3. #3
    Mustafa Umut Sarac's Avatar
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    ok , here is what the answer :

    paper is ligh transparent.
    If you hold the paper to the sun , projector or put on lighbox , you see the colors.
    if you want an slide bw , you scan the paper and print an bw slide

    Umut

  4. #4
    holmburgers's Avatar
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    A thought has occured to me.

    The only way to make a color photograph on paper by using a screen-plate would be if the screen-plate elements used during exposure (RGB) could be transmuted into their complentaries (CMY) upon processing and if the silver in the image (forming a positive image) was related to the density with which the CMY was laid down. The silver would have to be removed leaving only the dyes.

    In one example, red light would go through the red element, leaving a deposit of silver. The silver would "signal" (perhaps act as a catalyst) to the screen plate element that it needs to change color to cyan (color coupling? silver-dye bleach?). The density of the silver would relate to the amount of cyan that is created, and subsequently transferred to some support (DTR?). Imagine if the same element received no red light; no silver would be developed and no effect would be had on that red dye. This remaining screen-plate dye would somehow have to be removed, leaving a clear space on the support. This example would be a negative image though.

    How the heck you'd actually do this is the trick, but the development of photography seems to always have been coming up with some kind of schematic that yes, in theory should work, and then finding a serendipitous set of chemical reactions to make it a reality.
    If you are the big tree, we are the small axe



 

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