of color vs purplish

of color

adj
  • Nonwhite; of a race other than white, for example black. 

  • Belonging to a category of people with mixed black and white ancestry in the Americas in the 18th and early 19th centuries. 

purplish

adj
  • Somewhat purple in colour/color. 

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