Pochoir

This technique was developed in France in the early twentieth century. Translated “stencil,” this process allows the artist to directly add hand-colored areas to an impression by painting these areas through a stencil. The stencil itself is usually knife-cut from thin coated paper, paperboard, plastic, or metal and the ink or paint is applied with a brush. This technique is sometimes combined with other planographic methods, such as lithography.

Source: http://www.ifpda.org/content/collecting_pr...