bottle-blond vs dirty blonde

bottle-blond

adj
  • Having bleached hair in a shade of blond 

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. 

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