coal black vs pitchy

coal black

adj
  • Of an intensely black colour, like that of coal. 

noun
  • A black colour, like that of coal; charcoal. 

pitchy

adj
  • Very dark black; pitch-black. 

  • Off pitch; out of tune. 

  • Of, pertaining to, or resembling pitch. 

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