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  1. #111

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    With all the "meth labs" in my neck of these woods, you'd think that I could score some Diethyl cyanine iodide! I think I'll go over to "The Park" around 1:00AM and ask around.
    Been nice knowing you all,
    Bill

  2. #112

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    For those interested in spectra and related compounds, here's a nice local (Oregon) website that has a spectra of several dyes we might be interested in:
    http://omlc.ogi.edu/spectra/Photoche...tml/index.html

  3. #113
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    Thanks for the beta test, Kirk! There was a typo in the code.

    http://www.thelightfarm.com/Map/WhatsNew/whatsnew.htm

  4. #114

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    Quote Originally Posted by wildbillbugman View Post
    I think I'll go over to "The Park" around 1:00AM and ask around.
    Bill, if that doesn't work, try behind the school at 4:20...

  5. #115

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    Quote Originally Posted by dwross View Post
    Thanks for the beta test, Kirk! There was a typo in the code.
    Denise - wow - that was quick. Maybe take another look. The larger pages are the same size as the smaller ones - about 1 inch high and about the same wide. But it does show an image for the larger page now.

  6. #116

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    Quote Originally Posted by wildbillbugman View Post
    Hi Everyone,but especialy Ron
    www.holowold.com/holo/paper.html
    The above refference is to a paper by Blyth,et al. It mentions 2 dyes for green and red sensitzation.
    See also http://cabd0.tripod.com/holograms/id3.html
    And here is a practical commercial applications of it: www.smartholograms.com/

    Quote Originally Posted by wildbillbugman View Post
    The rest of the paper is about making a holographic plate by diffusion. I assume that the silver/halide grains are so very tiny that the plate would be worthless to anything but holography.
    That's the billion Dollar question! I don't really know the answer but my guess is this method might be worth a try in the photographic area also. I assume forming larger grains won't be rocket science...
    Personally, I am involved with holography, so I am far from being particularly knowledgeable about photographic emulsions.
    These bathing/sensitizing methods have been known for quite a while now, actually since the early days of photography. They're often complicated and not easy to do in a consistent repeatable manner. Obviously, you can't use these methods to produce photographic emulsions on a large scale.That said, they may still be of value to test a few things in a quick way. Moreover, they don't require sophisticated lab technology, no pAg measurements, no double jets etc.

    The beauty of Jeff Blyth's method is that it provides an incredible speed increase – despite the lack of sulfur/gold sensitization. The big speed enhancement stems from ascorbic acid reduction sensitization, done simultaneously with spectral sensitization. That's pretty amazing. Blyth's method allows for speed levels almost on par with the Agfa materials (until the late 90s Agfa used to be the market leader for holographic emulsions) – at a grain size 50% smaller than those commercial emulsions!

  7. #117

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    Quote Originally Posted by Kirk Keyes View Post
    For those interested in spectra and related compounds, here's a nice local (Oregon) website that has a spectra of several dyes we might be interested in:
    http://omlc.ogi.edu/spectra/Photoche...tml/index.html
    ...and here are some interesting dyes:
    http://www.organica.de/de/Produkte/4...ale_Farbstoffe

    and: www.few.de/English/index.htm

  8. #118

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    I assume forming larger grains won't be rocket science..


    Hi,
    Jeff uses difussion to intoduce the silver nitrate into the gelain coating. Unless I am way off, the only way to vary grain sise would be to coat a pre-existing, larger grain silver halide emulsion on the glass, then then spectraly sensitize the coating with dyes + ascorbic acid.
    Do you have a source for the dyes Jeff used ?
    Bill

  9. #119

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    I ment to say "spectraly sensitize by diffusion."
    Bill

  10. #120

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    Quote Originally Posted by dwross View Post
    Thanks for the beta test, Kirk! There was a typo in the code.

    http://www.thelightfarm.com/Map/WhatsNew/whatsnew.htm
    It's working really nice now, Denise.



 

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