What is the thickness of the layer or body of pigment applied by the painter to his canvas with especial reference to the juxtaposition of different colors and tints in forming a harmonious whole. Fairholt called?

impasto — The thickness of the layer or body of pigment applied by the painter to his canvas with especial reference to the juxtaposition of different colors and tints in forming a harmonious whole. Fairholt. (Webster's 1913.)