Like silverpoint, drawing in ink forces the artist to make confident marks as there is minimal correction that can be done. The better quality pen that is used, the better the results. Using pens of various diameters (0.1 mm, 0.3 mm, 0.5 mm, 0.7mm 1.0mm) allows the artist a wide range of marks and line widths. There are many ways to approach a subject with ink, including contour, stipling, cross hatching, blocking, sketching or any combination of the various styles. Bristol is an excellent paper for ink as it it smooth, accepts the flow of the ink consistantly and has a brilliant white surface which helps define the line. For precision work an artist should ideally use repitographs, but those take practice to master as the point needs to "float" above the surface and not press into the paper like a typical pen. Many artists have managed to get remarkable results from cheap disposable roller ball pens. However, you will never find a true black with any inexpensive equipment.