bronze vs caramelize

bronze

verb
  • To change to a bronze or tan colour due to exposure to the sun. 

  • To color bronze; (of the sun) to tan. 

  • To make hard or unfeeling; to brazen. 

  • To plate with bronze. 

noun
  • A naturally occurring or man-made alloy of copper, usually in combination with tin, but also with one or more other metals. 

  • A work of art made of bronze, especially a sculpture. 

  • A reddish-brown colour, the colour of bronze. 

  • Boldness; impudence. 

  • A bronze medal. 

adj
  • Made of bronze metal. 

  • Having a reddish-brown colour. 

  • Tanned; darkened as a result of exposure to the sun. 

caramelize

verb
  • To undergo this kind of conversion or browning. 

  • To brown (sugar, or a foodstuff containing sugar) by means of heat. 

  • To convert (sugar) into caramel. 

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