Closely related to Pointillism is the art of Stippling; using small dots to convey the form. Stippling is done with ink and specialty pens with various size tips to allow for different size dots. For finer detail, you use the smallest opening and space the dots farther apart.  For dark and dense areas, you use the larger pen tip and place the dots closer together.  Stippling may be done using different color ink. Sometimes an artist may add color with colored pencil after the ink has dried.