melange vs polychromate

melange

noun
  • A mixture of different things; a disordered mixture. 

  • A Viennese coffee speciality, half steamed milk and half coffee. 

  • A large-scale breccia formed in the accretionary wedge over a subductional environment. 

polychromate

noun
  • A salt or ion composed of multiple chromate groups 

adj
  • Composed of many colours 

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