multiracial vs polychromate

multiracial

adj
  • Composed of, or having a mixture of, multiple races. 

noun
  • An individual of more than one race. 

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

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