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  1. #101

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    Quote Originally Posted by Kirk Keyes View Post
    obsessive-compulsive ?
    Oh Yea!

    I am Guilty of that one too!

  2. #102

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    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.
    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. But would these dyes be apropriate for spectral sensitization of emulsions? One of the dyes is easy to get. But the other is on the Sigma-Aldrich "Don`t sell to individuals' list.
    Cheers,
    Bill

  3. #103

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    Bill - your link is bjorken, there's a typo - people should try this one instead:
    http://www.holoworld.com/holo/paper.html

  4. #104

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    Well, for the list Ron posted, I see Neocyanine, Kryptocyanine, Pinacyanol, Orthochrome-T, Ethyl Red, Piniflavole, Eosin, and Eyrthrosine as ones that are listed in the IR book I mentioned above. So it looks like a lot of those dyes have found use that's lasted for over 100 years.

    I also noticed 5-(p-Dimethylbenzylidene) rhodamine. That name looks really familiar, so I looked and checked CAS numbers, and it's also called 5-(p-Dimethylaminobenzylidene) rhodanine (notice the difference in the "n" and "m" in rhodanine/rhodamine). That an indicator that I use in the lab to titrate solutions of - get this - silver nitrate! The indicator is yellow in acetone solution, and when it reached the endpoint with silver nitrate, the solution becomes salmon color (under high pH of the titration).

    It's pretty cheap - $60/10g
    http://www.fishersci.com/wps/portal/...e+&catCode=ALL

    Another, Congo Red - common indicator - $35/5g, or if indicator grade works, really cheap - $63/500g.
    http://www.fishersci.com/wps/portal/...y&fromSearch=Y

    Ethyl Red Iodide - $70/5g,
    http://www.fishersci.com/wps/portal/...y&fromSearch=Y

    Neocyanine - $83/1g
    http://www.fishersci.com/wps/portal/...ne&catCode=ALL

    Kryptocyanine - $40/1g
    http://www.fishersci.com/wps/portal/...y&fromSearch=Y

    1,1'-Diethyl-2,2'-cyanine Iodide - 500mg/$65.
    http://www.fishersci.com/wps/portal/...y&fromSearch=Y

  5. #105

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    Hi Kirk,
    My guss is that Fisher will not sell all of these dyes to just anyone. Aldrich would not sell the Diethyl Cyanine Iodide to me,
    no mater how well I explained to them what I intended to do with it. Mabe the Formulary could buy them, then resell to us at twice the price.
    Bill
    P.S. Sor ry about the ttypo. Ido t.hat al ot. No Spelche k here.

  6. #106

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    4,5,4',5'-Dibenzo-3,3'-diethyl-9-methylthiocarbocyanine bromide

    Quote Originally Posted by Kirk Keyes View Post
    I also noticed 5-(p-Dimethylbenzylidene) rhodamine. That name looks really familiar... an indicator that I use in the lab to titrate solutions of - get this - silver nitrate!
    Kirk;

    You might want to look on you shelf for "Stains All" too!

    It is related to the dyes Ron mentioned- but off hand, I am not sure how effective it is... anyway it should be readily available to you!

    Ray

  7. #107
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    Here's some info that I hope will be useful, or at least entertaining.

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

  8. #108

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    Ray - I've never heard of "Stains All" before - I ain't no stinkin biochemist - but it looks like a good candidate. And the price is similar to the others I've listed.

  9. #109

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    Quote Originally Posted by wildbillbugman View Post
    My guss is that Fisher will not sell all of these dyes to just anyone. Aldrich would not sell the Diethyl Cyanine Iodide to me,
    no mater how well I explained to them what I intended to do with it.
    Bill - try to find a local chemistry supply house that you can go to and talk with them directly. Are there any that you dealt with from your professional life? If you let them know you worked in the technical field you did, they my be a bit more compliant. I have a feeling that works for me with my local chem store - I'm been buying from them for 20 years, both professionally and for personal stuff.

    They may be able to resell to you directly, and perhaps at a little less than having it shipped from Montana...

  10. #110

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    Quote Originally Posted by dwross View Post
    Here's some info that I hope will be useful, or at least entertaining.

    http://www.thelightfarm.com/Map/WhatsNew/whatsnew.htm
    Denise - nice python (?) app, like google books. But they smaller size is unreadable/usable, at least on my laptop, and the large version does not seem to load.

    The larger page shows this where the image should be:
    <img src="/Map/Books/PhotoEmulsion/Contents1.jpg" "/>

    Is there one too many quote marks at the end of the line?

    Kirk



 

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