PERMANENT ENTERNAL TATTOO INK 30ML , USE FOR PERMANENT BODY TATTOO DESING. They have adopted a part of the Hippocratic oath as their own philosophy, to "First, do no harm" when it comes to developing our tattoo ink They have adopted a part of the Hippocratic oath as their own philosophy, to "First, do no harm" when it comes to developing our tattoo ink, and of course, keeping your customer Safe.