#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
  supertype:  #coloring_material__colouring_material__colouringmaterial__color__colour  any material used for its color
  subtype:  #absorption_indicator  an indicator used in reactions that involve precipitation
     subtype:  #fluorescein__fluoresceine__fluorescent_dye__resorcinolphthalein  a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
        subtype:  #eosin__bromeosin  a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures
  subtype:  #acid-base_indicator__acidbaseindicator  an indicator that changes color on going from acidic to basic solutions
     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
  subtype:  #alpha-naphthol_test__Molisch's_test__Molisch_test__Molisch_reaction  biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha-naphthol in the presence of sulfuric acid
  subtype:  #oxidation-reduction_indicator__oxidationreductionindicator  an indicator that shows a reversible color change between oxidized and reduced forms

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