slaked lime vs viridian

slaked lime

noun
  • Calcium hydroxide, a soft white powder, produced by adding water to quicklime. It is used in making mortar and cement, and has many industrial uses. 

viridian

noun
  • A bluish-green pigment made from chromium sesquioxide. 

  • A bluish-green color. 

adj
  • Of a bluish green colour. 

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