pearly vs polychromate

pearly

adj
  • Of a pale greyish white colour, tinted with blue. 

  • Containing or yielding pearls. 

  • Resembling or characteristic of a pearl; nacreous. 

  • Having a pure sweet tone. 

noun
  • A tooth. 

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

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