There are no mistakes in Zentangle, so there is no need for an eraser. If you do not like the look of a stroke you have made, it then becomes only an opportunity to create a new tangle, or transform it using an old trusty pattern. A Zentangle tile is meant to be a surprise that unfolds before the creator's eyes, one stroke at a time.
Beckah Krahula, One Zentangle A Day: A 6-Week Course in Creative Drawing for Relaxation, Inspiration, and Fun
art, drawing, meditation, zen