chasing vs mezzotint

chasing

noun
  • Engraved or embossed decoration. 

mezzotint

noun
  • A form of intaglio etching in which a metal plate is roughened evenly and then smoothed to bring out an image. 

  • An etching or print made using this method. 

verb
  • To make such etchings 

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