- Types:
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phenolphthalein
a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8
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congo red
a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
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methyl orange
an azo dye used as an acid-base indicator; used for titrations involving weak bases
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litmus, litmus test
a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
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bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein
a dye used as an acid-base indicator
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bromothymol blue, bromthymol blue
a dye used as an acid-base indicator
