Paul de Lagarde offers reprint of MS Leiden regarding Ephrem's view of Ham's blackness.
Paul de Lagarde, Materialien zur Kritik und Geschichte des Pentateuchs, 2 vols. (Leipzig: B.G. Teubner, 1867), 2:89 (MS Leiden, Scaliger Arab 230)
Arabic text of Ephrem's comment. Translation: "Mar Ephrem the Syrian said: “When Noah awoke and was told what Canaan did . . . Noah said, ‘Cursed be Canaan and may God make his face black, and immediately the face of Canaan changed; so did the face of his father Ham, and their white faces became black and darkand their color changed.
This statement was likely attributed to Ephrem falsely, since it does not appear in any of the established works attributed to him. Scribes occasionally attributed such traditions falsely in order to give them a greater "stamp of approval" from Church notables.