Research on the Conservation Treatment, Morphology and Composition of Edo Period Lacquerware Based on Fundamental Structural Analysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K01123
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 03060:Cultural assets study-related
• Research Institution: Tohoku University
• Principal Investigator: SHIBATA KEIKO 東北大学, 埋蔵文化財調査室, 専門職員 (70322980)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 近世漆塗製品 / 保存処理 / 塗膜構造分析 / トレハロース / X線CT

Outline of Final Research Achievements

We analyzed the basic structure of 94 lacquerware, excavated from the Sendai Castle, including tree species, coating structure and chemical elements.
We attempted to treat for conserving the excavated lacquerware using the trehalose method. After the treatment, we analyzed them by X-ray CT and obtained some different inner images of lacquerware on the treatment condition. We understood the characteristics of trehalose crystallization based on the treatment condition. As a result, we sought more effective treatment condition for conserving the excavated lacquerware using the trehalose method.
From an archaeological perspective, we summarized the trends in coating structure and tree species by the types of the lacquerware, compared them with analyses from other Edo period sites. We collected historical records related to Edo period lacquerware, and all excavated lacquerware from the Sendai Domain. We explored the background of the craftsmen and the local production of the excavated them.

Free Research Field

保存処理

Academic Significance and Societal Importance of the Research Achievements

トレハロースの結晶化の特性を知ることで、近世の出土漆塗製品をトレハロース含浸処理法で保存処理する場合の押さえるべきポイントを理解することができた。この理解により、より有効性の高い処理条件の設定が可能となり、無駄のない安全・安心・安価な保存処理の一方法を導き出すことができた。持続可能な保存処理方法として発展させていきたい。
また考古学的、史料的調査ではこれまでまとめられていない近世仙台藩での出土漆器の背景に関する知見を得た。一括出土漆器を基に中世から近世までの漆器の変化、変遷をまとめた。