discolored vs polychromate

discolored

adj
  • Deprived of color, or given the wrong color; pale, stained. 

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

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