The Ink of Judas

The Gospel of Judas is back in the news with reports of how comparative ink analyses between Judas and more quotidian late-antique Egyptian documents (contracts, etc.) were used to help authenticate and date the Gospel.  By authenticate, I mean that it is an ancient document rather than a modern forgery, and, therefore, tells us important new information about ancient Christianity.  Looks like the ink comes from the third century CE.