dirty blonde vs towheaded

dirty blonde

adj
  • Of a dark blonde colour/color bordering on light brown. 

noun
  • A dark shade of blonde, bordering on light brown. 

  • A person with dark blonde hair. 

towheaded

adj
  • Having pale blond hair, resembling tow. 

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