enchase vs mezzotint

enchase

verb
  • To decorate with jewels, or with inlaid ornament. 

  • To cut or carve, as with a weapon. 

  • To be a setting for. 

  • To set (a gemstone etc.) into. 

mezzotint

verb
  • To make such etchings 

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. 

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