coloration vs pigmentation

coloration

noun
  • The quality of being colored. 

  • The act or art of coloring. 

  • Ornamental division (also called passaggi, glosas, diminutions. etc.) employing rapid black notes. 

  • A notational device for indicating hemiola through either use of red ink (in mensural black notation) or black noteheads (in mensural white notation). 

  • Political tendency. 

pigmentation

noun
  • Coloration of human, plant or animal tissue, especially by pigment. 

How often have the words coloration and pigmentation occurred in a corpus of books? (source: Google Ngram Viewer )