Erasing blue sketches...or not?

The clean up is proceeding nicely, as I've written before the blue pencil that I used for this chapter is very hard to erase. It really sticks, we're talking about ink-stickiness here. I'm not kidding! If I run out of ink or inkpens I can use this blue pencil with the same result!

Here it is in all it's glory:

I'm not saying that it is a bad pencil, I think it has many qualities, but if you are a draughtsman that sometimes fancy using your eraser from time to time, then maybe this pencil is not for you. On the other hand if you are an artist that very seldom use your eraser, then this pencil is for you!

Take care!