Figure 10 is a highly magnified close up photograph of the writing tip of a ball point pen. The rest of the pen is visible in the background but it is out of focus. Part of the ball protrudes from the metal part that holds it. It is difficult to judge how much of the ball is visible but it must be less than a hemisphere otherwise the metal part could not hold the ball in position. The ball is covered in ink and there is additional ink at the gap between the ball and the metal part that holds it. There is spillage around the ball onto the metal part and there are also bits of dried ink on the metal part.

 1.2.2 Disposable pens and mass production