japan vs lac

japan

noun
  • Lacquerware. 

  • A hard black enamel varnish containing asphalt. 

verb
  • To varnish with japan. 

lac

noun
  • A resinous substance or lacquer produced mainly on the banyan tree by the female of Kerria lacca, a scale insect. 

  • Laceration. 

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