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Main Author:	NONA, Dronova
Format:	Recurso digital
Language:
Published:	Zenodo 2025
Online Access:	https://doi.org/10.5281/zenodo.16838895
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Full Object Description (English): Tall stoneware vase with a lustrous black iron-rich glaze, decorated with evenly distributed partridge feather spots (鷓鴣斑, zhègū bān). The vessel’s form — a high body with gently swelling shoulders, a pronounced neck, and slightly flared rim — is highly unusual for this decorative effect, which is typically found on Jian ware tea bowls. Each spot displays a two-zone structure: a pale creamy core encircled by a russet-ochre halo with slight glassy melting at the edges. The dense, buff-to-yellow body shows a reduced dark zone beneath the glaze, consistent with high-temperature wood-fired kilns (approx. 1250–1300 °C) of the Song period. The decoration is technologically and stylistically linked to the black-glazed tradition of the Jian kilns (Fujian province) or closely related workshops, with possible parallels in Northern Cizhou-type “russet-splashed” wares. The piece is preliminarily dated to the Northern/Southern Song dynasty (11th–13th century). Large vases with the partridge feather glaze pattern are exceptionally rare and represent a museum-level example of elite Song ceramic technology. <h2>Interview (Beynons Method)</h2> Q1: What is the general type and presumed origin of this vase? A: This is a tall vessel with a dense black iron-rich glaze and a rare decorative effect known as partridge feather spots (鷓鴣斑, zhègū bān). Based on technological and stylistic traits, the piece is attributable to the black-glazed tradition of the Song dynasty, particularly within the sphere of influence of Jian kilns (Jianyao, Fujian province) or closely related workshops. The preliminary dating is Northern/Southern Song, approximately 11th–13th century. Q2: Why is the vessel’s form important for attribution? A: In the Jian tradition, the predominant output was tea bowls; large vases are extremely rare. The appearance of a partridge feather effect on a tall vase is exceptional and may point to either a commissioned, experimental work of the Song period, or a technologically related but non-typical production line. Its form demands careful scrutiny because it lies outside the most frequently published corpus of black-glazed wares. Q3: What are the key characteristics of the decoration and its technique? A: The spots exhibit a two-zone structure: a warm creamy-yellow core surrounded by an ochre-russet halo, with subtle glassy melting at the margins. Their arrangement is remarkably regular over the entire surface — unlike the more spontaneous distributions seen on Jian bowls, where spotting often forms in glaze run-off zones. Such a systematic, grid-like layout may indicate intentional application of an iron-bearing slip or pigment onto the raw or leather-hard black glaze. Q4: What are the possible technological mechanisms for producing this effect? A: <ol> <li> Jian-type formation — in-glaze segregation and crystallisation of iron compounds during firing, without external application, with spots embedded within the glaze matrix. </li> <li> Cizhou-type russet-splashed — surface application of ferric oxide slip over the glaze prior to firing; spots remain concentrated in the upper glaze layers. </li> </ol> Instrumental analysis (pXRF, SEM-EDS) is required to distinguish conclusively between these modes. Q5: Which diagnostic traits indicate authenticity and age? A: <ul> <li> Microscopic glaze bubbles and fine network (craquelure) consistent with wood-kiln, high-temperature firing. </li> <li> Natural firing wear at rim and foot, no evidence of modern grinding. </li> <li> Body fabric: high-fired, dense, buff-to-yellow fracture with a darkened, reduced zone beneath glaze. </li> <li> Mineral inclusions and natural interaction layers between glaze and body. </li> </ul> Q6: How rare is the application of partridge feather on large vessel forms? A: Extremely rare. The overwhelming majority of published and auctioned examples with this effect are tea bowls. Vases with evenly distributed partridge-feather patterning are virtually absent from catalogued collections, making this piece exceptionally important from both a collecting and museum perspective. Q7: What are the main recommendations for confirming attribution? A: <ol> <li> Elemental mapping of spots vs. ground glaze (pXRF/µXRF). </li> <li> SEM-EDS section analysis of “spot–glaze–body” to identify whether spotting is in-glaze or over-glaze. </li> <li> Petrographic thin-section analysis of body fabric vs. known Jian and Cizhou profiles. </li> <li> TL (thermoluminescence) dating where sampling is feasible. </li> </ol> <h2>Comparative Analysis & Literature References</h2> The partridge feather glaze effect belongs to the canon of three celebrated Song black-glaze patterns — hare’s fur, oil spot, and partridge feather. Robert Mowry’s seminal Harvard catalogue remarks: <blockquote> “The so-called partridge-feather glaze, with its buff-to-russet dappled marks, is the most elusive of the Jian glaze effects and appears with much less frequency than hare’s fur or oil spot” (Mowry, Hare’s Fur, Tortoiseshell, and Partridge Feathers, Harvard Art Museums, 1996, p. 226). </blockquote> Most recorded partridge feather wares are tea bowls (Harvard Art Museums, British Museum). Harvard Art Museums’ accession number 2002.50.44 describes: <blockquote> “… black-glazed bowl with russet dappled markings, sometimes called partridge feather mottles, produced in Jian-type kilns during the Southern Song period.” </blockquote> Sotheby’s (17 March 2021, Lot 562) describes a Song dynasty example: <blockquote> “A superb and rare russet-splashed black-glazed ‘partridge feather’ bowl, Song dynasty… the russet splashes evenly distributed, their two-tone cores revealing complex iron crystallisation.” </blockquote> The British Museum’s collection (OA+1635) notes: <blockquote> “…brown and black-glazed stoneware bowl, hare’s fur and partridge feather effect, Jian ware, 12th century.” </blockquote> No published auction or museum record to date documents a tall vase with a fully regular partridge feather grid. This absence underlines the object’s typological uniqueness. It is also noteworthy that similar effects are recorded in some Northern Cizhou-type wares, where Harvard explicitly states: <blockquote> “… the russet markings in overglaze iron oxide applied over a dense black glaze” (Harvard Art Museums, 2002.50.48). </blockquote> This opens the possibility of regional technological convergence during the late Northern Song–Jin period, which makes analytical confirmation critical. <h2>Expert Conclusion</h2> The examined artefact is a tall vase with black iron-rich glaze and partridge feather (鷓鴣斑) decoration, preliminarily dated to the Northern/Southern Song period (11th–13th century). Stylistically and technologically, it aligns with the elite segment of the black-glaze tradition — potentially within the Jian kiln sphere, though the regular spot distribution invites comparison with Northern “russet-splashed” techniques. Its rarity is defined by: <ul> <li> Form — atypical large vase within a corpus dominated by bowls. </li> <li> Decoration — evenly spaced, two-tone spots over the entire surface. </li> <li> Condition — excellent preservation of glaze effects without restoration. </li> </ul> If instrumental analysis confirms an in-glaze iron crystallisation mechanism, the vase would represent an exceptional and perhaps unique museum-level example of the partridge feather effect on a large vessel form from the Song era. <h2>Diagnostic Reference Features</h2> <ol> <li> Body fabric — dense, high-fired, buff fracture with reduced dark zone under glaze. </li> <li> Glaze — thick, lustrous, iron-rich black, fine craquelure, microbubbles. </li> <li> Spots — two-zone (light centre, russet halo), slight glassy melting at margins. </li> <li> Pattern layout — grid-like regularity over entire vessel. </li> <li> Firing traces — authentic wood-kiln oxidation/reduction transitions, no modern abrasions. </li> <li> Comparative rarity — no known published analogues for large vases with this decoration. </li> </ol>

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