polychromate vs prismatic

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

prismatic

adj
  • Separated or distributed by, or as if by, a transparent prism; formed by a prism; varied or brilliant in color. 

  • Of or pertaining to a prism; having the form of a prism; containing one or more prisms. 

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