Note 043
From Leo I. (A.D. 470) the Imperial ink, which is still visible on some original acts, was a mixture of vermilion and cinnabar, or purple. The emperor's guardians, who shared in this prerogative, always marked in green ink the indiction and the month. See the Dictionnaire Diplomatique, (tom. i. p. 511 - 513) a valuable abridgment.]
The History Of The Decline And Fall Of The Roman Empire Fall In The EastChapter 53