simple way of testing DAB solution

From:Amos & Theresa <>

Hi All,
    While we are on the topic, I have an interesting variation on this
question. Is there any qualitive way of testing to see if there is DAB in a
waste product? The DAB waste product is supposed to be separated from the rest
but it remains a brownish color. The waste collects the peroxide and the rest
of the IHC reaction products, so adding more of the same should not influence
the color of the product. So, I need another way of determining the presence of
the DAB. I certainly do not want to be incorrectly assuming the waste was
divides properly and discard it down the drain.
Amos Brooks

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