Showing posts with label Radiometric dating. Show all posts
Showing posts with label Radiometric dating. Show all posts

Tuesday, December 11, 2018

Papyrus Artemidorus in the News Again

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This article has been updated (additions/substitutions in italics).

In 2009 Peter Head wrote a short piece on this blog about the Artemidorus Papyrus. There has been an endless debate over the authenticity of this manuscript, purportedly a work by the first-century BCE geographer Artemidorus, which was purchased in the early 2000s by an Italian foundation related to a bank group for an unbelievable price of nearly 2.750.000 EUROS ($3,369,850). The papyrus was exhibited in 2006 and then published in 2008 as Il Papiro di Artemidoro by an Italian group of scholars. However, a professor from Bari, Luciano Canfora argued at a very early stage that it was a modern forgery, possibly by the infamous 19th century forger Constantin Simonides. So, there are two camps among scholars, one defending its authenticity, one arguing that it is a fake.

Now, the manuscript has surfaced in the news again, in Italian newspapers (here, for example), suggesting that the case is closed – the manuscript has been proven a forgery. What is this fuss about? Apparently, there has been a legal investigation and the prosecuting side, the Turin Public Prosecutor’s Office has confirmed that the papyrus is a forgery, based on investigations arranged by the Ministry of Cultural Heritage (Ministero dei Beni Culturali). Well, who did the prosecutors call in as expert? Answer: Luciano Canfora & co, the one side that has argued for a forgery for many years. In fact, the news article repeats Canfora’s hilarious proposal that “it is most likely a 19th-century forgery attributed to the Greek Constantine Simonides.” As one who has studied Simonides’ forged papyri (yes, I have just submitted an article on the topic to a major journal), I must say that the Artemidorus papyrus is nothing like the papyri we know were forged by Simonides. I am ready to go to Italy to testify, just invite me :-).

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What was more interesting than the old arguments by Canfora & co, however, was the anticipated “smoking gun” mentioned later on in the article, namely tests of the ink. There are no decisive evidence yet, but apparently, preliminary tests have supported the case for forgery (of course not specifically by Simonides) rather than authenticity, as suggested by Piero Gastaldo, Secretary General of Compagnia di San Paolo, the foundation that bought the papyrus (related to the Turin bank that now owns it) just before he resigned. But what tests and when?

 It is suggested that the ink composition is different from that which was used in papyri from the first to the sixth century (it is unclear whether they mean 1st century BCE here). Preliminary tests have detected zinc, and suggest that the fragments were placed on a metallic net that contained zinc, and then treated with acids. There is, however, no details of this testing, and it seems that the legal case is already closed … this is interesting.

One of our anonymous readers explains that these facts of the case were presented far too long ago for anybody to be charged at this point. It was a personal investigation by a judge who is now about to retire, and therefore  "he had to publish his findings now or never. For this reason the case is closed - without that judge following his personal interest and no possibility of charging anybody, no one in the legal system will not continue with the investigation."

In 2010, a Florence-based research group published the results of their tests on the Artemidorus papyrus in the journal Radiocarbon vol 52 (2010): 356–63. They tested both the writing material and the ink with various methods including radiocarbon. There was nothing they could find to prove the case for forgery – this is their conclusion:
C4 measurements have dated the papyrus to a period that is compatible with the hypothesis of the papyrologists. However, this result alone cannot be conclusive proof of the document’s authenticity. Some have already commented that a blank ancient papyrus might have been used to draw the inscriptions in the 19th century (even though it seems unlikely that a forger used such a great support). The ink analysis can add some important information: actually, all the results support the idea of the originality of the scroll. It is true that also in this case, someone has suggested that an expert forger might have simulated the composition of an ancient ink. In any case, in spite of and in addition to these results, discussion among the scholars is ongoing, mostly based on philological and linguistic issues. It will probably continue for a long time, at least until we are able to directly date theink (perhaps in the future!)
Finally, I should point out that there is a lot more to learn about ancient ink on papyri. In fact, last year, a group of Danish scholars showed for the first time that carbon black inks on ancient Egyptian papyri from different time periods and geographical regions contain copper. This article was published in Nature. I have recently learnt that my co-author Malcolm Choat, with whom I am working on Simonides, with two colleagues has received funding from the Australian Research Council (again!) for a project “to investigate the chemical composition of papyri from ancient Egypt and their inks to identify scribes, date texts, detect forgeries, match fragmentary texts, and illuminate environmental and technological change.”

All I know is that the last word on Papyrus Artemidorus is not said.  

Update 17/12/18: Luciano Canfora posted a link to the news article on the Papy-L discussion list. I then posed a question where we can read about the scientific analyses of the ink. From Canfora's reply (to me privately) it is clear that he did not know more than what the news article said (i.e., we have no further information about these tests).

Tuesday, March 10, 2015

Radiometric Dating of the Gospel of Judas

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Peter Kirby has put together an excellent survey of information on the 14C dating of the Gospel of Judas, here.  The whole issue is complicated, particularly for those without a firm grounding in the application of radiometric dating, but I can summarize the conundrum by saying that a National Geographic publication by Herbert Krosney suggested that the GJudas codex material could be assigned to 280 CE ±60 years, but then represented the results as all falling in the third century.  (Both are statements are problematic, but especially the second.)  This was unfortunate and created a great deal of confusion and speculation.  The Tchacos Codex would then be the earliest Coptic manuscript currently known!

Peter Kirby offers a number of learned insights, but in particular points out an important gross error on the part of Krosney.  Krosney did not understand how radiocarbon results should be “calibrated” against known radiocarbon evidence (tree rings), and instead simply subtracted his BP (“Before Present”) numbers from the year in which the results were produced (2005) to erroneously produce a series of numbers dating to the the third century.

The National Geographic Society granted the Arizona AMS laboratory permission to send me the actual results, and I am publishing an update on the dating of the Tchacos Codex based on the findings.  Again, it’s complicated, and I offer here only a summary.  Krosney made a number of errors, including simple typos.  This is a shame, because generally his two Judas books are well-executed.  In my forthcoming book chapter, I advance the theory of Peter Head, including the actual results from the reports, suggesting that the way in which the results were averaged is not codicologically optimal.  (The lab had six test results, and by averaging results one can reduce the deviation number which consequently reduces the date range from periods of greater than two centuries to periods of less than two centuries.)  Head has argued that instead of excluding one of the results from the leaves and averaging the remaining five, there should be two averages: one average of all three leaves and one average of the three binding elements.

My estimation following Peter Head’s thesis leaves a radiometric result in the late third through the end of the fourth century.  One should be aware that fourth century manuscripts will typically have calibrated dates ranging back into the third century.  The issues is that the amount of 14C carbon in the atmosphere dipped in the fourth century, and thus fourth century manuscripts generally look like third century manuscripts.  Notably, one of the individual calibrations of the papyri leaves offered a date range into the sixth century!

Thursday, April 10, 2014

Jesus’s Wife Resurrected from Dead

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INTRODUCTION

Eight of the eleven articles in the most recent issue of the Harvard Theological Review discuss the authenticity of the so-called Gospel of Jesus Wife (GJW), which Karen King publicized through a shrewdly-orchestrated media frenzy in September 2012. The core relevant articles include a survey of the papyrus scrap by King, a refutation of authenticity by Leo Depuydt and a response by King. Five supporting articles detail two spectroscopy examinations of the ink (Yardley and Hagadorn; Azzarelli, Goods, Swager), two radiocarbon datings of the papyrus (Hodgins; Tuross), and a paleographic evaluation (Choat).

Karen King’s initial argument that this fragment demonstrates a fourth century literary manuscript of the “the Gospel of Jesus Wife” is now officially dead, by her own admission. We are left with a deflated seventh to ninth century semi-literary scrap ... or a fraud. We have no plausible direct literary evidence for a new non-canonical gospel. The question remains as to whether we should recognize this scrap as an ancient semi-literary document or a modern fraud. According to King, the arguments concerning fraud are highly problematic, and the scientific and linguistic evidence repeatedly affirm authenticity. 
“The scientific testing completed thus far consistently provides positive evidence of the antiquity of the papyrus and ink, including radiocarbon, spectroscopic, and oxidation characteristics, with no evidence of modern fabrication.” (King, “Jesus said,” 2014, 154)

THE INK

According to the results, the ink used is indeed the most obvious choice for a modern forger — carbon ink. The ink is composed of soot. “The inks used in this manuscript are primarily based on carbon black pigments such as ‘lamp black.’” (Yardley etal., 164) King attempts to paint the resultant test as proving the implausibility of fraud, arguing that “their research to date shows that details of the Raman spectra of carbon-based pigments in GJW match closely those of several manuscripts from the Columbia collection of papyri dated between 1 B.C.E. and 800 C.E., while they deviate significantly from modern commercial lamp black pigments.” (King, “Jesus said,” 2014, 135) However, no one would suggest that this was forged with modern commercial pigments. Someone would have mixed soot with a solvent, producing the obviously low quality and uneven writing medium on the papyrus.

RADIOCARBON DATING

Using two labs, the GJW fragment and a Sahidic John fragment associated with the same papyri lot were carbon dated. The rounded 2-sigma ranges for the manuscripts are as follows:


GJohn
GJW
Harvard 
640–800 CE
650–870 CE
Arizona
680–880 CE
410–200 BCE

The second test (14 March 2014) was apparently ordered after the extremely early date arrived from Arizona (June–July 2013). Whatever the case, if one of the two GJW 14C dates were to be accurate, it would probably be the Harvard range (650–870 CE), which is corroborated by the related GJohn manuscript (chart above). Having said this, the result remains somewhat inconclusive. (δ13C levels were also higher than expected, suggesting contamination in all samples.)

So does this confirm the authenticity of the GJW? Such a late dating bulldozes King’s first appraisal of the manuscript as a fourth century witness. The GJW fragment under question is broken on all sides except the top, where apparently the modern forger cut the empty section off of a larger fragment which was in fact ancient. Carbon dating has no value for authenticating such a manuscript, although if the Ptolemaic date (410–200 BCE) offered by the Arizona AMS lab were accurate (of which I am not convinced), fraud would be certain.

PALEOGRAPHY

Choat’s assessment of the scribal hand is hardly an enthusiastic endorsement of its authenticity:
“Overall, if the general appearance of the papyrus prompts some suspicion, it is difficult to falsify by a strictly paleographical examination. This should not be taken as proof that the papyrus is genuine, simply that its handwriting and the manner in which it has been written do not provide definitive grounds for proving otherwise.” (162) 
His article surveys the oddities of the scribal hand, noting the lack of clear literary or documentary parallels. Choat states, “[w]hile I cannot adduce an exact parallel, I am inclined to compare paraliterary productions such as magical or educational texts.” (Choat, 161)

DEPUYDT

Leo Depuydt presents the argument which is accepted by most specialists who are familiar with the GJW. The modern forger (1) created the text by rearranging several sentences from the Gospel of Thomas and (2) unintentionally left evidence of the fraud through two grammatical infelicities ("blunders"). The first is the omission of the object marker ⲙ- in line one (ⲧⲁⲙⲁⲁⲩ ⲁⲥϯ ⲛⲁⲉⲓ ⲡⲱ̣[ⲛϩ]). The second is the awkward construction ⲣⲱⲙⲉ ⲉⲑⲟⲟⲩ (more correctly ⲡⲣⲱⲙⲉ ⲉⲑⲟⲟⲩ or ⲣⲱⲙⲉ ⲉϥϩⲟⲟⲩ). Depuydt also mentioned a third serious error, which I believe to be the most damning evidence against authenticity (186); in line 6, the forger has combined a positive habitual from GThomas with a negative habitual to create the nonsense chimera verbal phrase ⲙⲁⲣⲉⲣⲱⲙⲉ ⲉⲑⲟⲟⲩ ϣⲁϥⲉ{ⲓ}ⲛⲉ (“Evil man habitually does not he does habitually bring” sic). Notably, Francis Watson, Alin Suciu-Hugo Lundhaug, and Andrew Bernhard have popularized many of these arguments, detailing how Depuydt’s first "blunder" seems to derive from a typo in Michael Grondin’s 2002 online PDF of the Gospel of Thomas.

KING’S RESPONSE ARTICLE

In Karen King’s mind, if one can not exhaustively prove the inauthenticity of the GJW fragment, then it must be accepted as authentic. The results from spectography, radiometric dating and Choat’s paleographic analysis all leave the door open, therefore the fragment is undeniably authentic. Karen King maintains the problematic infinitive form ϣⲁϥⲉ “swell,” and ignores the persuasive reasoning behind the reconstruction of the damning error above. I encountered no serious discussion of this in her original article. In my opinion, this argument alone inauthenticates the GJW fragment, yet King is unconcerned, instead positing an unattested verbal form. I could imagine why someone might differ with me on various issues here, I can not identify with the stiff-necked concluding statement of King: “In conclusion, Depuydt’s essay does not offer any substantial evidence or persuasive argument, let alone unequivocal surety, that the GJW fragment is a modern fabrication (forgery).”


CONCLUSION

If a husband were to genetically test his children to determine whether his wife had been faithful, and the tests returned indicating that the children could not conclusively be proven to not be his, would this assure him of his wife’s fidelity? Could he then, based upon these tests, be confident that he had indeed fathered the children? Karen King has produced no new evidence to authenticate this fragment. On the contrary, her prior contentions that the GJW fragment was (1) part of a literary codex and (2) was fourth century are now indefensible. Her method of argumentation was not self-critical or objective, but will doubtlessly be sufficient for those who already want to believe.

THE HANDWRITTEN NOTE

One has to ask why Karen King has not published the notorious handwritten note. A typed 1982 note signed by Peter Munro accompanied the fragments which indicated that a Coptic John fragment was among the manuscript group (cf. King, “Jesus said,” 2012, 2). The second notorious handwritten note reads as follows:
“Professor Fecht believes that the small fragment, approximately 8 cm in size, is the sole example of a text in which Jesus uses direct speech with reference to having a wife. Fecht is of the opinion that this could be evidence for a possible marriage.” (King, “Jesus said,” 2014, 153)
Odd, is it not, that Munro mentioned a dime-a-dozen Sahidic manuscript in the typed note, but detailed the GJW in a handwritten note separately?! This handwritten note potentially bears the hand of the forger, who cut the papyrus, falsified the text, and aided its journey with the convenient handwritten note. King’s failure to publish this handwritten note conveniently eliminates a clear avenue for identifying the perpetrator.