Example of Scientific Expert Report on an Authentic Guan Yao Vase (Bamboo-Form Bottle), Based on the Diagnostic Protocol (2025.08)

Author: Prof. Nona Dronova, PhD, DrScDOI of Diagnostic Protocol: 10.5281/zenodo.16732927 1. Object Identification Type: Vase (bottle in the form of bamboo)Estimated Date: Southern Song / Early YuanOrigin: Guan yao kiln system (presumably from Laohudong context)Material: High-fired ceramic with crystalline glaze 2. Glaze Color Classification CIELAB (visually estimated): L* ≈ 62, a* ≈ −1, b* ≈ +3Tone: Neutral Dust-Bronze Hue with olive-grey microgradientsColor Type: Falls into the grey matte category as defined in Section II of the ProtocolObserved Variation: Ranges from soft olive-grey (shoulder area) to slightly warmer honey-brown near the base 3. Optical Effects Butter-Honey Optical Shift: Confirmed — under side lighting, a soft warm creamy-yellow shift is observed Crystalline Dust-Matte Texture: Visible under 30–60× magnification; matte scattering due to glaze microcrystals Edge-Lamella Effect: Observed at transitions between bamboo segments Gunmetal Sheen: Present; micro-iridescence and dark reflective gloss visible under raking light 4. Crackle Network (Craquelure) Type: Single-color, colorless craquelure, corresponding to the Huiqing subtypeColor of Lines: No coloration — crackle lines are transparentDistribution: Evenly distributed across shoulder and base, visible under macro lensTransitional Behavior: Local bifurcations and confluences observed near the foot 5. Structural Features Profile: Vertical bamboo-segmented neck, rounded shoulder, short baseRelief Modeling: Formed without press molds, continuous smooth modeling — indicative of the Cheng Ni Wei Fan methodBody Color: Light grey stoneware body, clearly visible in footring area under microscope 6. Footring and Support Traces Footring: Flat, unmarkedSupport Scars: Microscopic triangular marks on the base — likely from 3–5 firing spursFiring Zone: Distinct darkening in the basal ring area consistent with a reducing kiln atmosphere 7. Microstructure and Glaze Surface (Microscopy) At 30×–100× magnification: Crystalline matte surface with anorthite-dominant glaze structure Fine bubble inclusions scattered throughout Irregular crystal clusters near the footring — indicating glaze layering No signs of modern polishing, synthetic pigments, or restoration 8. Diagnostic Conclusion According to the Diagnostic Protocol for Authentic Guan Yao Ware (Version 2025.08), the examined object meets all required criteria: Reproducible glaze colorimetry Distinctive single-color, colorless crackle network Verified optical effects (Gunmetal Sheen, Butter-Honey Optical Shift) Constructive evidence of traditional firing and footring structure Absence of modern imitation tools, pigments, or repair Conclusion: The vase is an authentic Guan yao artifact from the Southern Song / Early Yuan period. 9. References Dronova, N. (2025). Diagnostic Protocol for Authentic Guan Yao Ceramics. Zenodo. DOI: 10.5281/zenodo.16732927 Ye Zhemin (叶喆民). 《“官窑”试论》 Kyoto Ceramics Journal. Glaze Consolidation in Late Guan Ware. 2019 Qingliangsi Guan Kiln Excavation Bulletin, CNKI, 2022 Palace Museum Collections Series 《文物珍品大系》 SEO Keywords (中文):官窑,官窑瓶,南宋官窑,竹节瓶,官釉,金口,开片,官黄,宋代瓷器,拉赫东窑址,官釉鉴定,科学鉴定,故宫藏瓷,南宋瓷器