iridescent vs party-coloured

iridescent

adj
  • Producing a display of lustrous, rainbow-like colors; prismatic. 

  • Brilliant, lustrous, or colorful. 

party-coloured

adj
  • Coloured with different tints; variegated. 

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