Bromophenol blue (3',3",5',5"-tetrabromophenolsulfonphthalein, BPB, albutest) is used as an acid-base indicator, a color marker and a dye. It can be prepared by slowly adding excess bromine to a hot solution of phenolsulfonphthalein in glacial acetic acid.
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“I have just come down from my father.
Higher and higher he lies
Above me in a blue light
Shed by a tinted window.”
—James Dickey (b. 1923)