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  1. #1

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    Source for erythrosine

    Hello Everyone,
    I finaly ran out of erythrosine and need a new source. Sigma-Aldrich will not sell me water anymore. Is "red dye #3" the same as erythrosine?
    Bill

  2. #2
    kb3lms's Avatar
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    Is "red dye #3" the same as erythrosine?
    Yes. From wikipedia: "Erythrosine, also known as Red No. 3"

    Try Alfa Aesar. Erythrosin B is listed on their website. They will only ship to a business address but they were going to sell me a small quantity of Eosin Y for a reasonable price. They also list a number of other dyes, including cyanines. http://www.alfa.com

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

  3. #3
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    Try to figure out the CI number ( i think it stands for color index) of the dye. There are good organic chemistry web sites that list dyes by CI and the assocated classic names and also known as lists.

    A lot of dyes are used to stain tissue and thus bring out cell structure. Some react at visible and some and UV , and some are UV only.
    my real name, imagine that.

  4. #4
    kb3lms's Avatar
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    According to wikipedia, the CI is 45430
    All this has happened before, and all this will happen again.

  5. #5

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    For those interested, Chemsavers has erythrosine.

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    This week I found a seller on eBay that sells FD&C Red 3 (Erythrosine) powder. She swears it is the pure food grade dye with no other ingredients, $6.00 per oz. I'll report back if it works or not.

    Also, google Magnacol and try them for dyes. They are out of the UK and sell small quantities of all sorts of dyes erythrosine, rhodamines, eosins, for reasonable prices. No cyanines though. They are on ebay as seller "scuddlebutt3." I got my current batch of erythrosine from them.
    All this has happened before, and all this will happen again.

  7. #7
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    Cyanine Dyes

    Chemsavers also lists a number of cyanine dyes, at least at this time. Not any less expensive than anywhere else but maybe more obtainable.
    All this has happened before, and all this will happen again.

  8. #8
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    Bill, I get mine from ANTEC chemicals (kyantec.com).

    PE

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    McCormick red food colour might also do the trick: a mix of erythrosine and allura red, some prop glycol and paraben preservative.
    - Ian

  10. #10
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    Allura Red is an azo dye which should not hurt the sensitization at all, and will probably just wash out. If you could fix it in the coating it could help make a nice dye bleach material! (Just kidding - it would be too dilute to work well.)

    PE

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