Every time players use a Vaal Orb, it has an evenly split chance to (25% chance):
No effect (other than adding the corrupted property if not already present).
Changing one or more sockets to white sockets.
Adding a special Vaal implicit OR replacing an existing one.
Bricking it by converting it into a rare item (sockets, links and six random affixes are randomized). This outcome removes all accumulated implicits and white sockets, while making further corruptions impossible.