poster paint vs tempera

poster paint

noun
  • A tempera paint, often with a type of gum-water or glue size as its binder, and sometimes supplied in powdered form. 

tempera

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

  • A painting done in this medium. 

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