I recently ordered colouring pencils from Faber Castell, Polychromos.
I started with the set of 24.
I used to use these about 10 years ago (when I was about 14 years old) and I liked them very much. I remember I had a really old set which was a hand-me-down from my sister, and she got them from her boyfriend who first got them when he was a kid! So, not to make it seem like something negative, the opposite, really. Because those pencils were still in really great shape! I think I still have them (for nostalgia) in my closet somewhere.
The problem I had, though... was my inexperience, really. I used a too dark/soft charcoal pencil so the colour would smudge together with the grey outlines and also, I DIDN'T KNOW YOU COULD MAKE LAYERS WITH THEM!! I've watched some videos on youtube (although I am skeptic about watching other people draw for my own benefit) and I found one girl which used paint thinner to blend the colours together and also to get it intense. But another artist used a rubber gum, I think... I think it is called a rubber gum.
. . .
(searching the internet...)
. . .
You know this kind of eraser...
I guess it's called art eraser. In swedish, it is called knådgummi.
Anyhow! You can use this eraser to blend the Faber Castell colouring pencils. Supposedly...
I haven't tried that myself, yet, and there are more ways to blend these pencils so I am going to try them all and find out which one I prefer.