ash blond vs dirty blonde

ash blond

noun
  • A shade of blond with a hint of grey to it. 

  • A person with such hair. 

adj
  • Greyish blonde. 

dirty blonde

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

  • A person with dark blonde hair. 

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

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