What printmaking technique is based on the observation that grease and water will not mix?

The printmaking technique based on the observation that grease and water will not mix is called lithography. In this process, an image is drawn with a greasy substance on a flat surface, typically limestone or metal. The surface is then treated with water, which adheres to the non-greasy areas, and ink is applied, sticking only to the greasy areas, allowing for the reproduction of the image. This technique enables artists to create detailed and nuanced prints.