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Dating silks

Dating silks

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Buyid silk forgery is one of the most famous silk forgeries in the world. Inexcavation of the Bibi Shahrbanu site in Iran unearthed several silk textiles.

Now Mehdi Moini, a chemist at Smithsonian's Museum Conservation Institute, has developed a technique to date silk based on its chemical composition. TECHNICAL NOTE telemeetlove.site Dating Silk By Capillary Electrophoresis Mass Spectrometry Mehdi Moini,* Kathryn Klauenberg, and Mary Ballard Museum. A new mass-spectrometry method will allow museum scientists to date ancient silks from just the fluff that falls off these priceless textiles (Anal.

In the s, more silk appeared and was reported as being from the Buyid period as well. Controversy over the authenticity of these silks escalated after the purchase of the silks by museums throughout the world.

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It was found that most of the datings silks are not from Buyid period. To test the authenticity of these silk fabrics, the recently developed silk dating technique using amino acid racemization AAR in conjunction with capillary electrophoresis mass spectrometry was applied to 13 Buyid silk specimens from the Textile Museum collections.

Among these dating silks specimens, the AAR ratios of only one specimen were consistent with authentic silk fabrics collected from various museums. In addition, the aspartic acid racemization ratio of this specimen was also consistent with its 14C dating.

The other "Buyid silks" showed excessive click of amino acid racemization not only for aspartic acid, but also for phenylalanine and tyrosine, inconsistent with racemization rates of these amino acids in authentic historical silk fabrics.

Treatment of modern silk with a base at different pH and temperature reproduced the AAR pattern of the Buyid silks, implying that chemical treatment with a base at relatively high temperatures was perhaps the method used to artificially age these fabrics.

The results imply that the racemization ratios of aspartic acid, phenylalanine, and tyrosine can be used as biomarkers for identification of naturally versus artificially aged silk.

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