Polaroid "Print Coater" substitute (aka "Caustic Jelly")

Discussion in 'Darkroom Developing and Printing' started by Some Dude, May 7, 2005.

  1. Some Dude

    Some Dude Guest

    I'm shooting a little with my Polaroid Land Camera Automatic 100 (type
    47 film I believe) and am wondering what is inside these "Polaroid
    Print Coater" tubes. It must be a fixer of some sort but the tubes are
    35 years old so the "brush" is dried out. I am thinking a quick dunk
    into some regular hypo should do it. It smells faintly acidic more
    like stop than hypo, though.

    Any thoughts?

    Some Dude, May 7, 2005
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  2. I think it is just solvent with a plastic dissolved in it. It dries
    very fast and puts a protective coating on the print. If it had fixer
    [i.e., the print needed fixing] then the print would turn black with
    time, instead uncoated polaroids fade. Polaroid negatives are dipped,
    in sodium sulfite to stabilize them.

    I am sure there is a patent [knowing Polaroid, more like 10 patents]
    that describe just what goes on with print coating.

    http://www.uspto.gov/main/patents.htm click upper right - 'search patents'
    Nicholas O. Lindan, May 7, 2005
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  3. Some Dude

    Some Dude Guest

    Some Dude, May 13, 2005
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