blue-red vs heliotrope

blue-red

noun
  • A colour between blue and red; purple or crimson. 

adj
  • Of a colour between blue and red; purple or crimson. 

  • Consisting of the colours blue and red individually. 

heliotrope

noun
  • A light purple or violet colour. 

  • Particularly, a purple-flowered plant of the species Heliotropium arborescens. 

  • A bloodstone (a variety of quartz). 

  • An instrument, employed in triangulation, that uses a mirror to reflect sunlight toward another, very distant, surveyor. 

  • The fragrance of heliotrope flowers. 

  • A plant that turns so that it faces the sun. 

adj
  • Light purple or violet. 

  • Keeping one’s face turned toward the sun. 

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