enamel vs tempera

enamel

noun
  • A coating that dries to a hard, glossy finish. 

  • The hard covering on the exposed part of a tooth. 

  • An opaque, glassy coating baked onto metal or ceramic objects. 

  • A cosmetic intended to give the appearance of a smooth and beautiful complexion. 

verb
  • To form a glossy surface like enamel upon. 

  • To variegate with colours, as if with enamel. 

  • To coat or decorate with enamel. 

  • To disguise with cosmetics, as a woman's complexion. 

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 enamel and tempera occurred in a corpus of books? (source: Google Ngram Viewer )