A clever bit of detective work by US scholars and scientists has proven that one of the jewels of the University of Chicago’s manuscript collection is, in fact, a skilled late 19th- or early 20th-century forgery. Although speculation as to the authenticity of the Archaic Mark codex has been rife for more than 60 years, prior to this definitive research many believed it was an early record (possibly as early as the 14th century) of the Gospel of Mark and the closest of any extant manuscript to the world’s oldest Greek Bible—the fourth-century Codex Vaticanus. The earliest record of Archaic Mark dates to 1917 when it was listed among the possessions of recently deceased Athenian antiquities dealer and collector John Askitopoulos. In September of 1935, Askitopoulos’s nephew, Gregory Vlastos, contacted University of Chicago biblical scholar Edgar Goodspeed asking if the school wished to purchase the manuscript. The 44-page codex, measuring 11.5 x 8.5cm, was acquired by the university in 1937 for an undisclosed sum. The ongoing debate as to the codex’s authenticity re-ignited in 2006 with its digitisation, giving international experts an opportunity to examine the work closely for the first time. Beginning in 2007, Margaret Mitchell, Alice Schreyer and Judith Dartt from the university collaborated with research microscopist Joseph Barabe from the Illinois-based lab McCrone Associates, and manuscript conservator Abigail Quandt from the Walters Art Museum in Baltimore, to perform a cross-discipline, in-depth analysis of the codex. [...]