blackness vs dusk to dawn

blackness

noun

  • The state of being of African descent. 

  • The quality of being evil or dismal. 

  • The state or quality of being black in colour. 

  • The experiences and culture of African-American people. 

dusk to dawn

How often have the words blackness and dusk to dawn occurred in a corpus of books? (source: Google Ngram Viewer )