silver-grey vs silvering

silver-grey

noun
  • A shiny pale grey colour. 

adj
  • Of a shiny pale grey colour. 

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 silver-grey and silvering occurred in a corpus of books? (source: Google Ngram Viewer )