purpleness vs purpure

purpleness

noun
  • The state or condition of being purple in colour. 

purpure

noun
  • purpure 

  • A purple colour on a coat of arms, represented in engraving by diagonal parallel lines 45 degrees clockwise. 

adj
  • In blazon, of the colour purple. 

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