Derwent Inktense Pencils - Single
Combining the brilliant intensity of pen and ink with the versatility of line and wash, this pencil can be used for dry rich intense color or washed out with a little water to create a vivid translucent effect. The rich pigment extends further than traditional watercolor pencils, and is more opaque for true ink effect. Once dry it is permanent, allowing for artwork to be washed over with other media without bleeding. Sets are available here.