brownify vs henna

brownify

verb
  • To make or become more brown. 

  • To cause to contain more racially 'brown' people, elements, or culture. 

  • To become brown due to increased levels of humic material. 

henna

verb
  • To dye or tattoo with henna. 

adj
  • Of a rich reddish-brown colour. 

noun
  • A reddish plant substance, prepared from the dried leaves of this plant, used for temporary tattoos and hair coloring. Hair colorings range from bright red to earth brown to near black. 

  • A shrub, Lawsonia inermis, having fragrant reddish flowers 

  • A rich reddish-brown colour. 

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