Silkscreen application of Platinum emulsions?

Discussion in 'Alternative Processes' started by eli griggs, Jul 6, 2009.

  1. eli griggs

    eli griggs Member

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    Has anyone here tried applying platinum emulsion by using a silkscreen?

    If so what were the results, pros and cons?

    Eli
     
  2. Jeremy

    Jeremy Member

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    Con: ridiculous waste of emulsion adding up to $$$$$$$.

    When coating an 11"x14" screen with emulsion in silkscreening I use ~4 oz. When coating paper for an 11"x14" pt/pd print I use ~1.5mL.

    Maybe I'm misunderstanding what you're asking. The only thing I can think that would be similar is the photo-resist emulsion on the screen. If you're talking about applying the pt/pd emulsion through a screen that has already been prepared for printing then you'd waste even more emulsion.

    Silkscreening is done the way it is because the constituents for the process are so cheap.
     
  3. Steve Smith

    Steve Smith Subscriber

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    It's basically a potassium bichromate/dichromate emulsion.

    We have gallons of it here at work but I have never tried it for photographic use. I must try it out one day.

    I have also thought about coating emulsion with a screen. I think one of our fine stainless steel meshes without a stencil would produce quite a thin coat.


    Steve.
     
  4. eli griggs

    eli griggs Member

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    Thanks for the feedback.

    I'm asking as I'm curious as to which would waste less emulsion, a paint brush applicator or a fine screen process? As a painter, I see how much material a good brush will pick-up, lay-down and what washes out in the clean-up.

    A screen used to coat a number of sheets at one time would seem to be a better choice but real world experience is often different than theory.

    While I'm asking questions, does anyone here think an inkjet could be modified to lay-down emulsion?
     
  5. richard ide

    richard ide Member

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    Why not use a fine spray gun or airbrush. There might be a toxicity problem with aerial droplets.
     
  6. rdbkorn

    rdbkorn Member

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    The bad news - the pt/pd sensitizer doesn't have the viscosity of silkscreen inks, so unlikely to work. However, the good news is that many people use a "puddle pusher" to spread sensitizer onto paper. It's made of a glass tube with "handle" and is similar to a silkscreen squeegee in terms of operation. No screen necessary, the sensitizer is spread directly on the paper with the puddle pusher.
     
  7. Steve Smith

    Steve Smith Subscriber

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    Is it too thin to remain in a flooded screen?


    Steve.