I spent some time this afternoon playing with one from a favourite series of line drawings of Scots Pine trees, adding graphite to exploit the negative spaces.
Some while back, I bought some Derwent Graphitone pencils and two paper blending stumps (also from Derwent) and thought it was time to experiment with them. Since I've played with this pine tree image (and similar) many times before, it seemed like a good and familiar place to start on a rather showery and cold afternoon. These pencils are water soluble but I found they also blend well with the stumps. I used the darkest pencil (an 8B) but I also have a 6B and a 4B and will now give those a try too - perhaps with some water the next time.
On the basis of this afternoon, I think I'll find them most useful and will be taking them with me when I go to Scotland for a short break this weekend.
Now I look at the post on Blogger, I must apologise for the poorly reproduced photo. As is often the case, Photoshop hasn't coped well with enhancing a pencil drawing - and this time seems worse than most!