high color vs reddening

high color

noun
  • a pinkness or redness of the face; having rosacea; having a flushed face 

  • a strong color 

  • graphics with two bytes of storage per pixel, allowing for up to 65536 different colors 

reddening

noun
  • The act or process of becoming red or redder. 

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