A paleographical study at the British Museum in 1938 found that the text had undergone several corrections. The first corrections were done by several scribes before the manuscript left the scriptorium. Readings which they introduced are designated by the siglum אa. Milne and Skeat have observed that the superscription to 1 Maccabees was made by scribe D, while the text was written by scribe A. Scribe D corrects his own work and that of scribe A, but scribe A limits himself to correcting his own work. In the 6th or 7th century, many alterations were made (אb) – according to a colophon at the end of the book of Esdras and Esther the source of these alterations was "a very ancient manuscript that had been corrected by the hand of the holy martyr Pamphylus" (martyred in 309). If this is so, material beginning with 1 Samuel to the end of Esther is Origen's copy of the Hexapla. From this colophon, the correction is concluded to have been made in Caesarea Maritima in the 6th or 7th centuries. The pervasive iotacism, especially of the diphthong, remains uncorrected.