Whites are an upper tier Color, though not as high level as Gold. They are the priests and priestesses who oversee the ritual functions of Society, preserving the traditions of old. Said rituals tend to be done by virgin maidens wielding iron daggers and gold laurels, while children carry triangular standards of scepters, swords, and scrolls with laurels. They sometimes fulfill the role of a mentor, teaching young Golds about their role in Society. Despite these roles, it is stated that some white Judiciars also wielded real power in the Society.
Though Grays act as law enforcement along with the ever-obedient Obsidians, Whites also possess many methods for extracting information out of fugitives. Matteo implies that they have specially built facilities for this purpose, and utilise crude methods such as bodily mutilation all the way to truth serums.
Their naming system seems to be very simple, as most are named after virtues, or similar. There appears to be no system of family names or surnames, as all the Whites seen have only first names.