Making a scratch where you want to draw actually destroys the texture of the paper and forms another dent. Then draw colored lead on the scratch, and the original dent will appear. No need to buy an indentation pen. Empty ballpoint pens, pins and pointed nails can all be used as indentation pens. In the choice of paper, it is recommended to choose a slightly thicker paper with fine texture, good color and lint-free. Don't choose paper with clear surface grain, and don't choose paper with rough or medium grain.