long sweetening vs molasses

long sweetening

noun
  • A viscous, syrupy sweetener, generally molasses, but sometimes table syrup. 

molasses

noun
  • A thick, sweet syrup drained from sugarcane, especially (Canada, US) the still thicker and sweeter syrup produced by boiling down raw molasses. 

  • Anything considered figuratively sweet, especially sweet words. 

  • Any similarly thick and sweet syrup produced by boiling down fruit juices, tree saps, etc., especially concentrated maple syrup. 

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