brighten vs japan

brighten

verb
  • To make illustrious, or more distinguished; to add luster or splendor to 

  • To make more cheerful and pleasant; to enliven 

  • To grow bright, or more bright in color; to clear up 

  • To make bright or brighter in color. 

  • To become brighter or more cheerful in mood 

japan

noun
  • A hard black enamel varnish containing asphalt. 

  • Lacquerware. 

verb
  • To varnish with japan. 

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