etch vs intaglio

etch

verb
  • To engrave a surface. 

  • To make a lasting impression. 

  • To cut into a surface with an acid or other corrosive substance in order to make a pattern. Best known as a technique for creating printing plates, but also used for decoration on metal, and, in modern industry, to make circuit boards. 

  • To sketch; to delineate. 

intaglio

verb
  • To engrave or etch using intaglio. 

noun
  • Any printing method in which the ink is laid upon the sunken parts of the printing form. 

  • A design or piece of art which is engraved or etched into something. 

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