Researchers at Chulalongkorn University have developed an advanced nano-coating archival varnish that extends the lifespan of paper-based materials by 15–20 years. This innovation protects documents, paintings, and photographs from decay, mold, and discoloration, offering an effective solution for preserving cultural heritage in Thailand’s hot and humid climate.

Traditional preservation methods, such as storing items in ziplock bags in cool, dry environments, provide only limited protection. Recognizing this challenge, Dr. Lunjakorn Amornkitbamrung, a C2F postdoctoral researcher, collaborated with Associate Professor Dr. Kanet Wongravee from the Faculty of Science and Lecturer Dr. Panita Silapavithayadilok from the Faculty of Arts to create the nano-coating solution. Their invention recently received the Good Invention Award 2023 from the National Research Council and is already being used by leading libraries across Thailand.

The varnish builds upon Dr. Lunjakorn’s doctoral research at the University of Graz, Austria, where he studied natural extracts to slow paper decay. Upon returning to Thailand, he adapted the formula to withstand the country’s high temperatures and humidity. Laboratory aging tests simulating 20 years of wear showed that coated paper remained stronger, resisted yellowing, and remained mold-free compared to uncoated paper.

Composed entirely of organic cellulose extract using nanocomposite technology, the varnish is safe for both users and materials. It enhances the durability of paper by 65% while providing waterproof, UV-resistant, mold-resistant, and stain-resistant properties. The varnish is compatible with various cellulose-based materials, including textiles, wood, and antiques, preserving their condition without altering their appearance.

Libraries such as Chulalongkorn University’s Central Library and Chiang Mai University’s Central Library have reported positive results after applying the varnish to protect ancient documents. The research team is expanding its focus to develop preservation solutions for additional materials, including woodworking and stucco, ensuring compliance with conservation guidelines.

Dr. Lunjakorn envisions this innovation benefiting not only institutions but also individuals looking to safeguard important documents, artwork, and memorabilia. By addressing the unique preservation challenges posed by Thailand’s climate, the nano-coating varnish offers a sustainable and scientifically backed solution for conserving history and cultural heritage for future generations.

The product has been patented and is marketed under the trademark SalvaStory. For more information, email rebonding2024@gmail.com or visit Re-Bonding: Innovative Preservation.

Read the full article at Chulalongkorn University.