cupreous vs titian

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. 

titian

noun
  • A bright auburn colour, tinted with gold. 

adj
  • Of a bright auburn colour, tinted with gold, especially in reference to hair. 

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