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  1. #101
    wildbillbugman's Avatar
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    Ron,
    I can think of two suggestions off the top of my little head:
    1) Sensitization/visible wavelength blocking, for deep IR film.
    2) Testing and adjusting for "balanced" ortho and pan emulsions.
    Bill

  2. #102
    Photo Engineer's Avatar
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    Quote Originally Posted by wildbillbugman View Post
    Ron,
    I can think of two suggestions off the top of my little head:
    1) Sensitization/visible wavelength blocking, for deep IR film.
    2) Testing and adjusting for "balanced" ortho and pan emulsions.
    Bill
    Bill;

    I cannot get IR dyes to date, and when or if I do, you will not need any blocking and so can use green or yellow safelight.

    PE

  3. #103
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    Good AM Ron,
    Out of curiosity, are the IR sensitizers used in Kodak High Speed IR film "Top Secret"? Are they made exclusively for or by Kodak ? Or is it a matter of toxicity?

  4. #104
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    Bill;

    I'm not sure of the answer to any of your questions. I believe that both Sands and Honeywell make IR dyes. I do know that some of them were custom made and ran nearly $100,000 per batch of 1 kg. I also know that the IR dyes do not keep well. Therefore, a low volume product is not very cost effective if the dyes spoil and the product spoils.

    Any of these dyes which contain Selenium are extremely toxic. They should be avoided for home use. All sensitizing dyes have some level of toxicity, with accumulation in the liver. The exception, which is low in toxicity (almost nil) and is used as a food dye is Erythrosine. That is why I use it.

    PE

  5. #105
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    PE,
    Given the fact that selenium compounds are very toxic, it is surprising that anyone can still buy KODAK High Speed Selenium Toner. I have not used it since the Clinton administration. But just confirmed that it is still available.
    Bill

  6. #106
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    It may be the concentration or the actual chemical structure. Sensitizing dyes (cyanines, merocyanines, etc...) are not that benign to start with.

    PE

  7. #107
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    Steve,
    If you have a living Grandmother, you must be some kinda Wunderkind.
    Bill

  8. #108
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    Hello PE,
    There is now another motivation for a V2. I have read several reports that KODAK has discontinued T-max 100 and 400 in 8x10 . There biggest film size is now 4x5. Who woulda tawt?! That company just went to Hell after you left it.
    Bill

  9. #109
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    Quote Originally Posted by Photo Engineer View Post
    So, here is a question..... How important is color to you all? Is it worth up to 4x in price no matter what the price is?

    PE
    (Although I came in late.....)

    YES. And I would pay double that in a heartbeat.
    Last edited by rmazzullo; 12-11-2010 at 07:08 AM. Click to view previous post history. Reason: typo

  10. #110

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    PE - is it possible to have the color on plates and then have them all collected together at one place in the book, and then do the rest of the book in B&W? remember how they used to do that in the old days? (I.e. before I was born!)

    If most of the color is the IR stuff in green, then we could all probably live with that in monochrome since it is already monochrome.

    Or, do it all in B&W, and then make the color plates available as pdf downloads if people want to see a particular page in color.
    Kirk

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



 

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