cupreous vs sepia

cupreous

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

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

  • Of or of the nature of copper. 

  • Containing copper. 

sepia

noun
  • A dark, slightly reddish, brown colour. 

  • A sepia-coloured drawing or photograph. 

  • A dark brown pigment made from the secretions of the cuttlefish. 

adj
  • Of a dark reddish-brown colour. 

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