Draught of Forgiveness is a potion that can be consumed to reduce both Infamy and Crime Points by 100. They can be obtained from the marketplace for 15 Loyalty Tokens and can be traded by players. These potions are invaluable to pirates desiring to return to their original faction or players with a lot of infamy.
Note that this potion will not remove the 'Wanted' debuff from players, even when your crime points reaches zero.