Seat customer, mark ear lobes, preferably with gentian violet pen.
One medical study, using large amounts of gentian violet in rats, found that it could cause cancer.
Although cancer from gentian violet has not been observed in humans, some doctors choose not to recommend it for this reason.
The piercing site is cleaned and marked with Gentian violet or a single use, disposable piercing marker.
This can be done with a single use surgical marker or Gentian violet ink applied with a toothpick.