Second derivative spectrum analysis of dyed textiles for non-destructive, non-contact dye identification

2023 Fiscal Year Final Research Report

• Project/Area Number: 19H01362
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 03060:Cultural assets study-related
• Research Institution: Mukogawa Women's University Junior College Division
• Principal Investigator: KOHAMA Yuuki 武庫川女子大学短期大学部, 生活造形学科, 准教授 (60449874)
• Co-Investigator(Kenkyū-buntansha): 後藤 純子 共立女子大学, 家政学部, 教授 (20413057) ; 小林 政司 大阪樟蔭女子大学, 学芸学部, 教授 (60225539)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 染料 / 色彩 / 染色 / 染織 / 非破壊分析 / 顔料 / 二次微分スペクトル / ハイパースペクトル

Outline of Final Research Achievements

Non-destructive analysis of dyed textiles using hyperspectral cameras was studied.The analysis involved acquiring second-order differential spectra of the visible reflection spectra of dyed fabrics with a hyperspectral camera and matching them with a large amount of reference data.Spectra obtained with hyperspectral cameras were noisy.Derivative spectra amplify noise, so the accuracy of dull-coloured dye differentiation was poor.Vivid colours such as red and purple were shown to have the potential to differentiate.Elemental analysis by X-ray fluorescence analysis in combination with microscopic analysis provided useful information for differentiation.A new method of analysing spectra using Gaussian functions was also discussed.These findings were used to analyse dyed textiles before the early 20th century.

Free Research Field

被服学，染色学

Academic Significance and Societal Importance of the Research Achievements

近代以前の貴重な染織品を非破壊で分析して使われた色材の情報を得ることは染色文化財の保存管理のため，極めて有益である。本研究では，多量のリファレンスをもとにその手法の検証を行い，天然染料や無機顔料の非破壊鑑別の低くない精度での有効性を確認した。国内外の貴重染織品の分析に応用できる成果であり，既に他機関が管理する染織物の分析を実施し，使われ色材やその使われ方などについて様々な発見をしている。この成果は今後も染織品の分析に活用できる。貴重な染織品を適切に維持管理し，後世に受け継いでいくことに貢献するであろう。