blanc vs silvering

blanc

noun
  • A white cosmetic. 

  • A white sauce of fat, broth, and vegetables, used especially for braised meat. 

silvering

noun
  • The silver used in this kind of coating. 

  • The process of coating a surface with a thin layer of silver (or a similar metal), especially so as to form a mirror. 

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