4.5 Article

Effects of yellow natural dyes on handmade Daqian paper

Journal

HERITAGE SCIENCE
Volume 9, Issue 1, Pages -

Publisher

SPRINGER
DOI: 10.1186/s40494-021-00560-x

Keywords

Yellow natural dyes; Property changes; Historical paper; Conservation

Funding

  1. National key research and development project [2019YFC1520404]
  2. National Natural Science Foundation of China [U19A2045]
  3. Science and Technology Support Programme of Sichuan Province [2019YFS0494]

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This study evaluated the effects of traditional yellow botanical sources of dyes on the properties of traditional handmade paper. The results showed improvements in the mechanical properties of paper specimens after treatment with plant dyes, with different colorants' main components impacting the stability of the paper.
Natural yellow plant dyes and traditional medicines were used widely on historical papers in ancient China for religious reasons and conservation considerations. This study aims to evaluate some traditional yellow botanical sources of dyes that contain different chemical colorant compositions in order to understand their effects on the properties of traditional handmade paper. The physical and chemical changes in paper specimens treated with plant dyes were studied by examining properties such as the color, pH, thermogravimetric (TG) characteristics, tensile strength, folding endurance and microstructure by scanning electron microscopy (SEM). The results indicated that different colorants had different toning effects and that the main components, including carboxyl and ketone groups, could affect the paper stability at high temperatures. The results also revealed that the mechanical properties of paper specimens were improved after treatment with plant dyes. The significant improvements in the tensile strength and folding endurance and the slightly higher decomposition temperature of Amur cork tree-dyed paper could be ascribed to the strong interaction between the colorants' main components and the fibers. The scientific evaluation of the property changes is therefore valuable information for weighing the advantages and disadvantages of the various yellow toning materials for paper conservation treatment.

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