I was talking to a customer discussing a black pastels that he had been using. As he was describing the color it occured to me a possible way of making a black pastel using only black ingredients. Sure enough this worked for me, even better than I had anticipated. The resulting pastel had a slightly course feel and is sort of like drawing with a hole it is so dark. I added it to the end of the group of warm greys. The picture above shows the warm black that I make (#450) and this new black (#461).
The black and greys that I make (#450-460) have a little burnt umber mixed with the black to give a warm tone.