my friend Robert started sketching with grease free pastel pencils. We have a small group of astronomers here in Leipzig, and we meet us at every full moon in a public house. Slightly early we met us last Friday. Robert brought the pencils to there together with some sheets of black paper. I experimented a bit there. At the end Robert donated me his backup set of 4 pencils: black white light and dark grey. The pencils are form the Faber Pitt pastel series.
The moon was rather low in the sky and the air very unsteady. So I had to sketch a large are, I selected Clavius. I found it interesting, that I can sketch black over already sketched grey. Highlights are easy to get - the most complicated problem with my normal pencil sketches. Lare bright areas (the inner of Clavius) are harder to differentiate with that technique hower. Nevertheless, I'll make at least part of my moon sketches with that pencils.
Of course, I am not fully satisfied with this first try. It would be better to sketch the area larger. The sketch is slightly clumsy.