Question: Why is a Tattoo Permanent?
Why are tattoos permanent? When you think about it, anything else that is injected into the skin goes into the blood stream and gets broken down and washed away. Why doesn't tattoo ink do that? Well, there is a reason and it is best explained by the website How Stuff Works.
Their tattoo pages go into detail about how a tattoo is created and where the ink rests inside the skin as opposed to being dispersed.