ingrain vs mezzotint

ingrain

verb
  • To dye with a fast or lasting colour. 

  • To make (something) deeply part of something else. 

noun
  • An ingrain fabric, such as a carpet. 

adj
  • Dyed with grain, or kermes. 

  • Dyed before manufacture; said of the material of a textile fabric; hence, in general, thoroughly inwrought; forming an essential part of the substance. 

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