Given that some people are trying to emulate some old masters on the forums, I thought that uploading this colour set of mine, based on drawing colours available for old masters would be of interest. I've thrown in some colours that are pretty close to chalk, ebony, charcoal, sanguine (3), bistre and so on.
Try them with a buff, yellow, blue or toned background. Also toning the page with the watercolour tool helps make it feel a little more authentic.