fresco vs glazing

fresco

noun
  • The technique used to make such an artwork. 

  • A cool, refreshing state of the air; coolness, duskiness, shade. 

  • An artwork made by applying water-based pigment to wet or fresh lime mortar or plaster. 

verb
  • To paint using fresco. 

glazing

noun
  • The material used in such act or process; glaze. 

  • The act or process of glazing or an instance thereof. 

  • All the windows of a building. 

  • The art of covering with a vitreous substance. 

  • The part of a window or wall made of glass or another transparent material. 

  • Semi-transparent colours painted thinly over others to modify the effect. 

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