engobe vs percolate

engobe

noun
  • A clay slip which is colored with metal oxides or stains, used for coating the surface of a pot either before or after bisque firing. 

  • A non-black clay slip coating applied to a ceramic body to give it decorative color or improved texture. 

percolate

noun
  • A liquid that has been percolated. 

verb
  • To pass a liquid through a porous substance; to filter. 

  • To make (coffee) in a percolator. 

  • To drain or seep through a porous substance. 

  • To spread slowly or gradually; to slowly become noticed or realised. 

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