argentic vs silver-grey

argentic

adj
  • Of, pertaining to or containing silver. 

  • Of certain compounds, containing silver in a lower proportion than in argentous compounds. 

silver-grey

adj
  • Of a shiny pale grey colour. 

noun
  • A shiny pale grey colour. 

How often have the words argentic and silver-grey occurred in a corpus of books? (source: Google Ngram Viewer )