Analyzing ancient Chinese handmade Lajian paper exhibiting an orange-red color

• Published in: Heritage science Vol. 7; no. 1; pp. 1 - 8
• Main Authors: Luo, Yanbing, Chen, Jiali, Yang, Cheng, Huang, Yifan
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 15.08.2019; Springer Nature B.V; SpringerOpen
• Subjects: Bamboo; Chemistry and Materials Science; Color; Dyeing; Gold; Insects; Kaolinite; Lajian paper; Manufacture; Materials Science; Mold growths; Non-destructive; Optical microscopy; Orange-red; Photoelectrons; Protective coatings; Raman spectroscopy; Raw materials; Research Article; Restoration; Silver; Spectrum analysis; Turmeric dyestuff; Waxes; X ray photoelectron spectroscopy; Orange-red; Non-destructive; Manufacture; paper; Turmeric dyestuff
• ISSN: 2050-7445; 2050-7445
• DOI: 10.1186/s40494-019-0306-6

The ancient technique employed to produce Lajian paper—a very famous Chinese traditional handmade paper—has been lost. However, widespread restoration of the traditional skills used in the paper’s production is emerging in China. A small piece of orange-red Lajian paper dating from the Qing dynasty and decorated with flecked Ag and Au was chosen as the subject of this study to investigate the paper’s composition and structure using optical microscopy (OM), SEM–EDS, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and FTIR spectroscopy. The results revealed that the raw materials constituting the Lajian paper were bast and bamboo fibers. Each of the two paper layers was treated differently. First, the upper orange-red layer was treated with kaolinite and organic turmeric. Next, inorganic minium nt was used to obtain an orange-red color. Animal glue was used as a binding medium. Finally, the dyed surface was waxed with Chinese insect wax and then polished with small stones to form a smooth coating. The same treatment, except for the intentional use of inorganic pigment, was applied to the backing layer. Turmeric dye, minium, and wax coating protected Lajian paper from humidity and mold growth while maintaining the stability of the paper .