inscription vs mezzotint

inscription

noun
  • Text carved on a wall or plaque, such as a memorial or gravestone. 

  • Words written in the front of a book as a dedication. 

  • The text on a coin. 

  • The act of inscribing. 

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 inscription and mezzotint occurred in a corpus of books? (source: Google Ngram Viewer )