intermixture vs smelting

intermixture

noun
  • A mass formed by mixture; a mass of ingredients mixed. 

  • Admixture; an additional ingredient. 

smelting

noun
  • The process of melting or fusion, especially to extract a metal from its ore. 

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