claret vs cupreous

claret

adj
  • Of a deep purplish-red colour, like that of claret. 

noun
  • A dry red wine produced in the Bordeaux region of France, or a similar wine made elsewhere. 

  • A deep purplish-red colour, like that of the wine. 

  • Blood. 

cupreous

adj
  • Of a reddish-brown color, like that of polished copper. 

  • Of or of the nature of copper. 

  • Containing copper. 

noun
  • A reddish-brown color, like that of polished copper. 

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