oil painting vs tempera

oil painting

noun
  • A painting done with oil paints. 

  • The art of painting with oil paints. 

  • A physically attractive person. 

tempera

noun
  • A painting done in this medium. 

  • A medium used to bind pigments in painting, as well as the associated artistic techniques. 

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