As a term that's frequently used by art teachers, "value" in the sphere of drawing refers to the gap between the light and dark elements of a work. Also referred to as the white-to-black ratio, all paintings or drawings have a value between 1 and 10 with 1 standing for a 100% white page while 10 indicates a fully black page. A "value" of 5 would indicate a medium grey tone which is also called a 'halftone' because it is midway between white and black. When it comes to charcoal drawings, it is crucial to balance the value so that the drawing does not appear too shadowy or dark. A good charcoal work has a value of 6 or 7.