Goya: Monk Talking to an Old Woman
by Francisco José de Goya y Lucientes
watercolor on ivory, 1824/1825
Princeton University Art Museum
no copyright infringement intended
The Goya miniatures were painted on small squares of ivory around four inches square that had been coated with a ground of black carbon on which he dripped water which removed the carbon to reveal the shadow of white ivory below. He would then look into this wetness and manipulate it to produce the images that he saw emerging from it (http://redtreetimes.com/2011/07/26/goyas-miniatures/).