This is an interesting concept, @wellwild. I think I would still opt for a membrane sticker over a tattoo (even though I already have a tattoo). As technology advances I would prefer the option of being able to upgrade to the newest version, and that would be easier if it were in a removable membrane. Also, tattoo lines spread over time, making them less attractive than at first, and a membrane tattoo would not have that issue. The problem I see with it is that your biohealth would be visible for others to see, and you might not want that, so the membrane offers the additional benefit of being able to be moved if it was in an undesirable position.