cornflower vs cornflower blue

cornflower

adj
  • Of a blue colour, as that of the cornflower; cornflower blue. 

noun
  • Cornflower blue. 

  • A plant of the species Cichorium intybus. 

  • A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields). 

cornflower blue

adj
  • Of a bright blue color, with a tint of purple 

noun
  • A bright blue color, with a tint of purple. 

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