A few months ago I discovered an amazing new product from Derwent. They have taken charcoal and mixed it with various clays to produce tinted charcoal. I've tested them out on drawing paper to show the different colors. Most of the colors are very subtle greens, browns and blues.
They definitely have the feel of charcoal, and they blend well. I'm testing out making new colors by layering and blending the existing ones, and it seems to work pretty well. I do wonder how they compare to pastel pencils, as I have not tried those before.
Look forward to some colored works from me in the near future. I already have plans for one drawing and can't wait to get to it (I'll give a hint - it's another primate).