coating vs japan

coating

noun

  • A thin outer layer. 

  • A telling-off; a reprimand. 

japan

noun

  • A hard black enamel varnish containing asphalt. 

  • Lacquerware. 

verb

  • To varnish with japan. 

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