#dyeing  the use of dye to change the color of something permanently
  supertype:  #coloring__colouring  the act of of process of changing the color of something
  subtype:  #staining  (histology) the use of a dye to color specimens for microscopic study
     subtype:  #Gram's_method__Gram_method__Gram's_procedure__Gram's_stain  a staining technique used to classify bacteria; those that retain the gentian violet are gram-positive and those that do not retain it are gram-negative

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