delineation vs mezzotint

delineation

noun
  • An image of the outline of an object. 

  • The act of delineating; depiction. 

  • A graphic verbal description. 

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