#acid-base_indicator__acidbaseindicator  an indicator that changes color on going from acidic to basic solutions
  supertype:  #indicator.coloring_material  (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
  subtype:  #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
  subtype:  #congo_red  a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
  subtype:  #methyl_orange  an azo dye used as an acid-base indicator; used for titrations involving weak bases
  subtype:  #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
  subtype:  #bromophenol_blue__bromophenolblue__bromphenol_blue__tetrabromo-phenolsulfonephthalein  a dye used as an acid-base indicator
  subtype:  #bromothymol_blue__bromothymolblue__bromthymolblue  a dye used as an acid-base indicator

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