many-coloured vs polychromate

many-coloured

adj
  • Composed of a great number of different colours; multicoloured; variegated. 

polychromate

adj
  • Composed of many colours 

noun
  • A salt or ion composed of multiple chromate groups 

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