Sgrafitto and Stamped textures
Etching dark lines
Sgrafitto is an Italian term for scratching techniques usually associated with stratching through layered ceramic glazes to expose the underlying glazes. Do you recall those rainbow colors covered in black crayon you would scratch pretty pictures into as a child? Same concept. Still fun.
Shown in this example is a variation scratching a line with a fine sharp point, in this case a pen knife. The wet paint is sucked into the bruised paper fibers as you scratch across the wash, creating dark lines.
Used judiciously, this technique is excellent for adding details to landscape paintings in the form of naked trees and branches, and other flora.