coloration vs skin color

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. 

skin color

noun
  • The color of human skin. 

  • One's ethnicity. 

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