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  1. #61

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    Or just two differently sensitized emulsion.
    Denise is having success with a one dye, panchro system.

  2. #62
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    Bill;

    A two dye panchro system will work due to the blue speed inherent in all AgX emulsions. In fact, with the right dye, a single dye panchro system is possible, but I have not found any good dyes on the open market for this type of work.

    As for having achieved a given sensitivity, it is always useful to have separation exposures or wedge spectrograms to prove any given sensitivity. I learned that the hard way many many years ago.

    PE

  3. #63
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    Stock Solution

    Now that I am finally getting to a point that I will be able to try out my small stock of Eastman 2718 (aka Stains-All) dye, what is a good stock solution? My plan is to make up a 25ml dropper bottle to use for my experiments. I was thinking about a 1% stock solution in ethanol. Here is my reasoning:

    My emulsions almost always use 6g of AgNO3. At a molar mass of 169.87 for AgNO3, that gives 4% of a mole of silver. So if I was to use the dye at, say, 100mg / mole Ag, 6g AgNO3 would require 4mg of dye. (100mg/mole is a starting point. IDK what will actually work but 100mg make the numbers work out easier.)

    A 1% solution of dye should contain 10mg dye per ml, so I could use 0.4ml stock solution or about 8 drops.

    Sound OK?

    -- Jason
    All this has happened before, and all this will happen again.

  4. #64
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    I would use a more dilute solution so that you can measure it out more accurately. After all, 4 ml is easier to measure that 0.4 ml.

    It is the word "about" that bothers me.

    PE

  5. #65
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    OK, that is a thought. I suppose the extra ethanol wouldn't hurt since I always add some at coating time anyway.

    I should have added that this batch of dropper bottles I have has ml marking on the droppers and also since it is roughly 20 drops to the ml that is why I said about 8 drops.

    I also have 1ml syringes.

    Anyway, then it seems like I am thinking along the right lines? At the cost of this stuff I'd rather not mess it up! (Actually, what I have was pretty cheap, but to replace it won't be.)

    Thank you for the info!
    All this has happened before, and all this will happen again.

  6. #66
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    You are doing OK.

    PE

  7. #67

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    Hi Jason,
    I am super-interested in your results regarding KODAK Stains-All. But is it something that can still be purchased? Do you have a structure for it?
    Bill

  8. #68
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    Stains-all is a fairly common histological dye with an impressive chemical name: 1-Ethyl-2-[3-(1-ethylnaphtho[1,2-d]thiazolin-2-ylidene)-2-methylpropenyl]naphtho[1,2-d]thiazolium bromide, 3,3′-Diethyl-9-methyl-4,5,4′,5′-dibenzothiacarbocyanine .

    Whew! Stains-all is easier to pronounce. Note that it's a carbocyanine.

    Sigma-Aldrich: http://www.sigmaaldrich.com/catalog/...g=en&region=US
    - Ian

  9. #69
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    Bill,

    It'll be a little bit before I have results. First, I have to get the freakin mice out of my workshop and reorganize. It got cold all of a sudden and of course they all wanted to come inside!

    Stains-all is readily available from a number of suppliers. There's Sigman and Fisher, of course, but Lab Depot, Chemsavers, and other such places list it as well. It sells in the range of $100/gram. Search under "Stains-All", not the impressive chemical name. The CAS Number is 7423-31-6.

    I've started wondering if my doctor (as in MD) could order these histological dyes from their suppliers? He does some of his own lab work with microscopes, etc, for fun, I guess; he has a whole little lab setup in the back of his office building. Most of the dyes we are interested in have some use in that field as well.

    -- Jason
    All this has happened before, and all this will happen again.

  10. #70

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    Thanks Jason,
    I may try to get some of this dye. I am currently doing more experiments with the Sands sda3057. Using it as a single, panchro dye. Should have some results by Saturday. If I get it to work, I will run with it, despite its high price. Bill



 

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