What is "bromophenol blue"

n. (context organic compound English) An acid-base indicator, ''2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxyphenyl)-1,1-dioxo-3-benzo[c]oxathiolyl]phenol''

n. a dye used as an acid-base indicator [syn: bromphenol blue, tetrabromo-phenolsulfonephthalein]

Bromophenol blue (3′,3″,5′,5″-tetrabromophenolsulfonphthalein, BPB, albutest) is used as a pH 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.