coppery vs cupreous

coppery

adj
  • Containing copper, especially if abundantly. 

  • Resembling the metal copper, especially in color. 

cupreous

adj
  • Containing copper. 

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

  • Of or of the nature of copper. 

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

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