amaranthine vs purple dye murex

amaranthine

noun
  • A dark reddish-purple colour. 

  • The amaranth flower. 

adj
  • Of a dark reddish purple colour. 

  • Relating to the mythical amaranth flower that never fades. 

  • Unfading, eternal, immortal, infinite. 

  • Relating to, or having the form of plants of the genus Amaranthus. 

purple dye murex

noun
  • A species of medium-sized predatory sea snail, Haustellum brandaris, which secrets a substance that can be used to make a long-lasting purple dye- Tyrian purple. 

How often have the words amaranthine and purple dye murex occurred in a corpus of books? (source: Google Ngram Viewer )