You might also be interested in Watercolor Pencils

Long a favorite of  artists and designers for doing sketches and layouts, in recent years colored pencils artists have turned colored pencils into a fine art medium, using them to create fantastic works of art. Colored pencils are made with pigments in a mixture of waxes and oils. They are not water soluble. They can be  layered or blended using a blender pencil or solvent.