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Extinction coefficient

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Quick question: Does anyone know where I can find the extinction coefficient of bromocresol purple? Also known as molar absorptiviy coefficient. I have tried CCR, merck, e-journals, scifinder and even enlisted the help of our chemistry librarian and nothing. Any help would be great, I mean if you know the ext.coef. that would be great but I really need to know where to find it more, so that I can site it in my report. Thanks for any help.

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