Smooth shading (one single value without additional lines or marks) to be done in compressed and/or vine charcoal.
Hatching (repeated lines in a single direction) and cross hatching (repeated lines in two directions that cross) to be done in pencil. (no need to smudge, just leave the lines)
Stipple (collection of dots) can be done in either pen or fine tip marker.
Spray these scales with fixative BEFORE class. Please do not spray indoors!!