Attribution of an Imperial Chinese Vase of the 18th Century Based on the Analysis of the Base, Reign Mark, Painting Quality, and Firing Complexity (with Microphotographs)
Year: 2025
Type: article
Abstract: Author: Private Collection (attribution for scientific purposes, as a reference of authenticity criteria and technological sophistication)Period of Attribution: Imperial kilns of Jingdezhen, Qianlong reign (1736–1795)Style: 粉彩 (famille rose / fencai), celadon transparent glaze with hidden relief (暗花 / anhua), gilding, underglaze cobalt mark. Abstract A fragmentary analysis of an antique Chinese vase is presented: the base with an underglaze cobalt four-character imperial reign mark “乾隆年製”, the ornamental border at the foot, a section of enamel painting (ruby-red “birds-and-flowers” panel), and the boundary of gilding. The diagnostic features — microstructure of celadon glaze with relief (anhua), character of underglaze cobalt, stratigraphy of famille rose enamels with soft gradients, hand-applied gilding with muffle fixation, as well as the typology of decoration and decorated base — allow attribution of the piece as the work of the imperial kilns during the Qianlong period. The publication is limited to fragments and microphotographs without general views. The presented material is proposed for use as a reference set of authenticity criteria and indicators of technological complexity in future attributions. Keywords: porcelain, Qing, Qianlong, 粉彩, fencai, famille rose, 乾隆年製, celadon, 暗花, gilding, underglaze cobalt, microstructural analysis. 关键词 (ZH): 清代 御窑;乾隆;粉彩;青花釉下款;描金;青釉;暗花;显微结构;真伪标准;工艺复杂性。 Introduction Imperial porcelain of the Qianlong reign (1736–1795) represents the pinnacle of technological and artistic mastery of the Qing dynasty. Court aesthetics are characterized by complex famille rose/fencai enamels with gilded outlines, rich “birds-and-flowers” panels, elaborate borders, and the use of hidden relief (暗花 / anhua) under transparent celadon glaze. Of particular value is the decorated base with painting and an underglaze reign mark — a sign of the highest rank of production. This study concentrates on the diagnostics of key areas — base, mark, enamels, and gilding — and formulates a reference set of criteria for subsequent use in scholarly attribution. Materials and Methods Examined areas: 1) base of the vase with painting on a greenish ground and four-character mark “乾隆年製” in a blue square frame; 2) lower border with turquoise cartouches and pink meander; 3) section of ruby-red panel with “birds-and-flowers” compositions; 4) boundary of gilding on enamel; 5) celadon transparent glaze with relief (anhua).Methods: stereomicroscopy and microscopy (×50–×200), macro photography with raking light, comparative visual analysis with museum parallels; non-destructive stratigraphic evaluation by observing layer features (runs, bubbles, halos, boundaries). (Note: portable XRF and/or micro-Raman may be added to confirm the lead–silica enamel matrix, presence of gold/copper, lead arsenates, antimonates, etc.) Results 1. Underglaze cobalt reign mark “乾隆年製” Form: square seal, characters in seal script (篆書, zhuanshu). Pigment: cobalt with uneven pooling, localized concentrations and lighter gaps — a sign of hand painting. Position: mark placed on a decorated base, typical for high-status court wares. Glaze covers the cobalt, confirming underglaze application. 2. Celadon transparent glaze and hidden relief (anhua) Under raking light, delicate relief ornament (leaves/scrolls) appears beneath the greenish transparent glaze. Observed oily luster and fine network of natural craquelure, consistent with long-term aging of high-temperature glaze. Relief applied prior to glazing, then covered with glaze and fired at high temperature. 3. Famille rose enamels on ruby-red panel Gradient transitions in petals (white→pink→lilac), presence of vitreous runs and microbubbles. On red areas — micro-scratches and micro-cracks of the upper layer, typical of old lead–silicate enamel. Gilded outlines of plants and birds visible over enamels. 4. Gilding (application boundary) Brushstrokes clearly visible, micro-breaks, irregular edges — signs of hand-applied gold leaf. Gilding lies on top of enamel and was fixed by muffle firing, evidenced by localized matte zones and slight fusions. 5. Body and base rim Rim shows iron-rich inclusions and natural granularity of fired porcelain; moderate wear. Transition from glaze to unglazed rim with characteristic “glassy” chip and aged patina. Discussion 5.1. Technological markers of imperial quality (Qianlong period) Decorated base with painting and underglaze mark — privilege of court wares. Hidden relief (anhua) under celadon — labor-intensive technique, rarely seen on later copies. Complex famille rose palette with soft gradients and “glassy” luster points to a lead–silica enamel matrix typical of the 18th century; pinks achieved with colloidal gold (“Purple of Cassius”), greens with copper; opacity from lead arsenates/antimonates. Hand-applied gilding with traces of muffle fixation — standard practice of the imperial kilns. 5.2. Comparison with museum analogues (typological) “Birds-and-flowers” panels, blooming peonies and magnolias, “壽 / shou” medallions, elaborate borders, apple-green/pink/ruby-red grounds — all correspond to late Qianlong court production (NPM Taipei; Palace Museum Beijing; Met/Bonhams deaccessioned parallels). 5.3. Exclusion of later copies Later replicas usually show: uniform printed-like gilding without brushstrokes, no anhua, simple single-layer enamels without smooth gradients, marks in overglaze transfer, “sterile” base rim. The present piece demonstrates the opposite features. Conclusion The combination of diagnostic features — hand-painted underglaze mark “乾隆年製” on a decorated base, celadon transparent glaze with hidden relief (anhua), stratigraphy and gradients of famille rose enamels, hand-applied gilding with muffle fixation, and the character of body and rim — allows attribution of the piece as an imperial vase of the Qianlong period (second half of the 18th century), produced at the Jingdezhen kilns for the court. The vase represents the pinnacle of artistic and technological triumph achieved by the imperial kilns of Jingdezhen during the Qianlong reign, combining the sophistication of enamels, reliefs, and gilding with the symbolic richness of decoration. It is an astonishing work, with no equal anywhere in the world. Table 1. Diagnostic features and their interpretation Feature Observation Interpretation Base mark 乾隆年製, underglaze, hand-painted, square frame Imperial kiln; 18th-century technique Base decoration Greenish ground with floral branches High status, court production Celadon glaze Oily luster, natural craquelure, hidden relief (anhua) High-temperature firing, complex preparation Famille rose enamels Gradients, vitreous runs, microbubbles Lead–silica matrix; 18th-century technique Gilding Brushstrokes, muffle fixation Hand-applied imperial gilding Base rim Granular body, iron-rich specks Old firing, natural wear Illustrations (descriptions) Fig. 1. Vase base: greenish ground with painting, four-character underglaze mark “乾隆年製”.Fig. 2. Microphoto of mark (×100–×200): cobalt unevenness, glaze overlap.Fig. 3. Celadon glaze under raking light (×100): appearance of anhua relief, natural craquelure.Fig. 4. Fragment of ruby-red panel (×100): vitreous lead enamel with micro-scratches of aging.Fig. 5. Gilding boundary (×150): brushstrokes, slight fusions.Fig. 6. Base rim (×80): granular body, iron inclusions. Acknowledgments and rights Text — CC BY 4.0.Images/microphotographs — CC BY‑SA 4.0.Only fragments are published for scientific purposes. References (selected; for manuscript) National Palace Museum (Taipei). Special Exhibition of Ch’ing Dynasty Enamelled Porcelains of the Imperial Ateliers. Taipei, 1992/1993. The Complete Collection of Treasures of the Palace Museum. Porcelains in Polychrome and Contrasting Colours (Vol. 38); Famille Rose and Enamelled Porcelains (Vol. 39). Beijing: Commercial Press. Colomban, P., et al. In-situ Raman and XRF studies of Qing enamels and famille rose palettes. Sotheby’s / Christie’s / Bonhams catalogues of imperial famille rose wares of the Qianlong period.
Author: NONA, Dronova
Language: English
Subfield: Archeology
Field: Arts and Humanities
Domain: Social Sciences
Open Access status: green
OpenAlex ID: W7077157592
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