Venetian red vs mahogany

Venetian red

adj
  • Of a brownish red colour. 

noun
  • A brownish red colour. 

  • A pigment producing this colour, derived from nearly pure ferric oxide (Fe₂O₃) of the hematite type. 

mahogany

adj
  • Having the colour of mahogany; dark reddish-brown. 

  • Made of mahogany. 

noun
  • Any of the trees from which such wood comes. 

  • A reddish-brown color, like that of mahogany wood. 

  • mahogany 

  • A Cornish drink made from gin and treacle. 

  • The wood of any of various tropical American evergreen trees, of the genus Swietenia, mostly used to make furniture. 

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