What if the carbon refill doesn't come out?

Step 1: Take out the carbon refill from the pen tube.

Step 2: Put the end of the refill in your mouth and blow into it for about 10 second.

Step 3: Before processing, the carbon pen has ink, but the words written are intermittent and light in color.

Step 4: After blowing, the ink can be closer to one end of the pen tip, and the written words are full of ink, which is no longer intermittent.