[Bill Douglas]

Half a lifetime ago I worked at a scientific iinstitute and asked a group of scientists what it would take to produce a tattoo ink that would fade/disappear after five years.

They said NO. Everyone has different skin with different levels of light (UV's) making it through. And if you had a tattoo ink that "would be gone by the time you are married" you would get your arse suited off. Some people it would be gone in a year, and others ten years later still have F' You written on thier forehead.