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A Note on Lead-Isotope Analyses of Faience Beads from China.” the Journal of Glass Studies Vol

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A Note on Lead-Isotope Analyses of Faience Beads from China.” the Journal of Glass Studies Vol Brill, Robert H., et al. “A Note on Lead-Isotope Analyses of Faience Beads from China.” The Journal of Glass Studies vol. 33 (1991): 116-118. Notes A Note on Lead-Isotope Analyses TABLE I of Faience Beads from China Sample Pb-3400 In 1 g8g, the results of a chemical analysis of a (NISTno·3-333 small fragment of a faience bead from China ap- peared in this journal.l The exact provenance of the Faience bead(s) 2.07 27 bead was unknown, but it definitely came from one from Rujia village of a few groups of such beads excavated in Baoji and FufengCounty, about 120-150 kilometers west of Xian. The beads were found in Western Zhou of the same fragment was carried out at the Na- tombs, and many have been dated to the ninth- tional Institute of Science and Technology in eighth centuries B.C. As was explained in the earlier Gaithersburg, Maryland. The results (sample Pb- publication, the beads are really faience, not glass,2 3400) are shown in Table l. a fact that was a bit disappointing to those who at In a forthcoming publication,4 one of the authors first had hoped that the discovery of the beads (WS) reports a lead-isotope analysis of three would move the date of the earliest glass finds in faience beads from the Rujia village excavation in China back some five or six centuries. Nevertheless, Baoji. The sample analyzed was a mixture of frag- the beads still occupy an important niche in the archeology of China because they are either evi- dence of an early but fleeting existence of faience I. Robert H. Brill, Stephen Shap Chow Tong, and Zhang pyrotechnology in western China or else very early Fukang, "The Chemical Composition of a Faience Bead from imports. In either event, the beads imply early con- China," Journal of Glass Studies, v. 3 I, 1989, pp. I 1-15· tact with civilizations to the west. 2. During September 1990, one of the authors (RHB) examined several dozen of the beads in question while visiting I t would be very nice to know where these faience museums in Baoji and Fufeng County. These examinations re- beads were made. They could have been made lo- confirmed the opinion that a majority of these beads are best cally in Western China, in Central Asia, in the Near classified as glassy faience, and the remainder as faience. A few East, or possibly even in Egypt. The chemical of these beads, which might bejudged at first glance to be glass, analysis showed that the composition of the inter- seem in actuality to be glassy faience that was heated excessively; they still contain much unreacted quartz. stitial glassy phase within the faience body of the 3. For general information on the application of lead-isotope bead is somewhat unusual. In itself, however, the analysis to glass studies, see Robert H. Brill, I. L. Barnes, and analysis is not sufficient to indicate where the bead B. Adams, "Lead Isotopes in Some Ancient Egyptian Objects," was made. The analysis also showed that the bead Recent Advances in Science and Technology of Materials, v. 3, New York and London: Plenum Press, 1974, pp. 9-27; Robert H. Brill, contained approximately 0.005% lead. At this Kazuo Yamasaki, I. L. Barnes, K. J. R. Rosman, and M. Diaz, trace level, the lead must have been an impurity in "Lead Isotopes in Some Japanese and Chinese Glasses," Ars one of the raw materials, most likely the copper Orientalis, v. I I, 1979, pp. 87-109; and I. L. Barnes, R. H. Brill, colorant. (Cobalt was not detected.) and Emile C. Joel, "Lead Isotope Studies of Early Chinese The presence of lead in the bead suggested a Glass," in Scientific Investigations of Early Chinese Glass, ed. Robert follow-up study because lead-isotope analyses can H. Brill andJohn H. Martin, The Corning Museum of Glass, chapter 5. (In press.) often be useful for identifying the geographic 4. Wang Shixiong, "Some Glasses from Zhou Dynasty Tombs 3 sources of leads extracted from ancient materials. in Fufeng County and Baoji, Shaanxi," chapter I 4 of forthcom- Therefore, a lead-isotope analysis of a minute chip ing book cited in note 3. 116 Rakow Research Library, The Corning Museum of Glass - http://www.cmog.org Brill, Robert H., et al. “A Note on Lead-Isotope Analyses of Faience Beads from China.” The Journal of Glass Studies vol. 33 (1991): 116-118. ments of tubular, spherical, and rhombic speci- CHINESE GLASSES - EARLY PERIODS 2.4 mens dating from the Yu Kingdom (781-77 I B.C.)? I I I I I These results are also shown in the table. 2.3 Chemically, the Rujia beads are distinctly differ- <II o 610 0 ent from sample Pb-3400. They contain = 10% 02.2 C- - """ 0 0 >- 0 0 '" lead, probably introduced along with the copper <I 0 <>:2.1 c<! colorant. The colorant could well have been derived .D . Cl.w <> 2c- RUJIO - from a Zhou Dynasty bronze artifact, many of C\J which are moderately leaded. In addition, the Rujia "- ffla Pb-3400 if 1 . 9 sample differs markedly from sample Pb-3400 in CD <> C\J its lead-isotope ratios. 1.81- - Pb3400.87b Figure I is a plot oflead-isotope ratios for approx- PCHNeo.87b imately 40 early Chinese glasses, along with those 1.7 for a few glazes and samples of Chinese blues/pur- 1.6 I I I I I .65 .7 .75 .8 .85 .9 .95 ples. Sample Pb-3400 lies near the center of the 207Pb I 206Pb RATIO graph, and the Rujia analysis is somewhat to the FIG. I. Lead-isotope ratios for Chinese glasses oj the Warring right. Pb-3400 does not seem to match any of the States Period through the Han Dynasties. Note the wide range oj early Chinese glasses we have so far analyzed or, variation. Datafor two Chinesefoience beads (solid dots) are also for that matter, any of the glasses of later periods, plotted. For legibility, symbols have been drawn rather large, corre- or any Chinese lead ores we know of.6 sponding to approximately ± 0.2% oj the nominal values. The The Rujia analysis shows its lead to be of an actual overall analytical uncertainty ( ± 2a) is approximately one- isotopic type rather common in China. Allowing third oj this range, exceptfor the Rujia sample,for which it mqy for the fact that the analysis was done in a different be greater. laboratory, the lead can be regarded as a fairly close match for those in four Han Dynasty glasses. 7 Perhaps the Rujia beads were colored with scrap EGYPTIAN GLASSES, FAIENCES, AND KOHLS from a bronze made in the same region where the Han Dynasty glasses were later to be made-al- 2.1 - though that region could have been located some o distance from where the faience beads were made. • 0 Rujlo The most significant point is that if the beads really >- were made someplace where Zhou Dynasty bronze <I + '".D Cl. was readily at hand, that would suggest they were W a made in western China. C\J 2- - "- .D Cl. CD a C\J • Pb -3400 Pb3400.87c 5. The samples were combined by the analyst because they PEGPe.87c were so small. That makes it difficult to interpret the results, PCHNeo.87c since one has no idea of how much the samples vary from one 1 . 9 "---------'--_---'---_L-------'--_---'-I_----'---_-L-----'-_----'--------' another. Having no other way to proceed, we elected to treat the .~ .8 .E 207Pb I 206Pb RATIO data as if they represented a mixture of three leads that were, isotopically, very similar. FIG. 2. Lead-isotope ratios for Egyptian glasses,foience glazes, 6. All of the Chinese glass data will be published in chapter and kohls oj the [2th-[8th dynasties (crosses). Data for two 5 of the forthcoming book cited in note 3. One source of data Chinese foience beads (solid dots) are also plotted, as are a ftw for Chinese ores is Chen Yuwei, Mao Cunxiao, and Zhu Bing- Chinese glasses (squares). Note the expanded scale from Figure [. quan, "Lead Isotope Composition and Genesis of Phanerozoic Metal Deposits in China," Geochimica, v. 3, no. 9, 1980, pp. Dimensions oj symbols correspond to approximately ± o. [% oj 215-229 (in Chinese). An English version of the tables of data the nominal values. The actual overall analytical uncertainty will appear as chapter 16 in the same forthcoming book. ( ± 2a) is approximately one-half oj this range, except for the 7. Barnes, Brill, and Joel [note 3]. Rujia sample,for which it mqy be greater. 117 Rakow Research Library, The Corning Museum of Glass - http://www.cmog.org Brill, Robert H., et al. “A Note on Lead-Isotope Analyses of Faience Beads from China.” The Journal of Glass Studies vol. 33 (1991): 116-118. Figure 2, an enlarged portion of Figure I, shows, them to collaborate with laboratory scientists able in addition, data for about 50 specimens of ancient to conduct the analyses required. Egyptian glasses, faience glazes, and kohls. 8 (Egyp- tian kohls were usually finely powdered galena, the Robert H. Brill naturally occurring mineral form of lead sulfide.) Robert D. Vocke,Jr. The Egyptian samples date from the 12th to 18th Wang Shixiong dynasties, considerably earlier than the faience Zhang Fukang found in China. The glasses and glazes contain substantial levels of intentionally added lead in the form of the pigment Pb2Sb20 7. It can be seen that the trace of lead in Pb-3400, the faience bead from * * * China, comes tantalizingly close to matching the The Portland Vase leads toward the lower end of the range of Egyptian samples.
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