verdigris vs vert

verdigris

noun
  • The colour of this patina or material. 

  • A blue-green patina or rust that forms on copper-containing metals. 

verb
  • To cover, or coat, with verdigris. 

vert

noun
  • A green colour, now only in heraldry; represented in engraving by diagonal parallel lines 45 degrees counter-clockwise. 

  • A vertical surface used by skateboarders or skiers. 

  • vertebrate 

  • In sport, a type of bicycle stunt competition. 

adj
  • In blazon, of the colour green. 

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