The Lacquer Craft of the Corridor Coffin (徼道棺) from Tomb No. 2 of Tushan in Eastern Han Dynasty, Xuzhou

Tomb No. 2 of Tushan in Xuzhou is the tomb of King Chu of the Eastern Han Dynasty, and it was an important archaeological discovery in China. The unique placement and crafting techniques of a lacquer coffin that was unearthed from the burial corridor are of significant importance in the study of tombs. In order to characterise the sample’s microstructure, elemental composition, and structural composition, as well as to study the crafting techniques of the coffin in the corridor, a range of analytical techniques were employed, including ultra-depth microscopy, scanning electron microscopy with SEM-EDS, Raman spectroscopy, FTIR, and XRD. The results indicate that the cross-sectional structure of the fragments comprises a pigment layer and a lacquer ash layer, with the latter being further divided into tile ash and bone ash layers. No lacquer film layer was observed. The primary colouring agent in the pigment layer was HgS, which contained a minor quantity of organic binder. The primary component of the tile ash layer was quartz, while the osseous ash layer comprised particles and collagen derived from mammalian bones. The lacquer crafting technique employed in the construction of the coffin was relatively simple and inconsistent with the assumption of it having a noble status. The findings of this research offer experimental data for the identification, preservation, and technical restoration of the corridor coffin in the future.