It's a race against time, as generations of cultural heritage conservators at the Dunhuang Academy make a great effort to protect the artistic charm of the Mogao Caves, a UNESCO World Heritage Site, despite erosion (侵蚀) by sand and wind.
The team is dedicated to protecting the 45,000 square meters of murals (壁画) and more than 2,400 painted sculptures of the 735 caves of the site, the construction of which lasts about a thousand years, from the 4th century to the 14th century. The cultural relics are the product of the cultural exchanges that took place over centuries on the ancient Silk Road. "Our work, repairing murals and painted sculptures, is to better preserve (保存) the caves, which promotes the great Dunhuang spirit of inclusiveness to the world and inspires modern people," says Su Bomin, director of the Dunhuang Academy.
Commonly seen "diseases" affecting the murals include cracking and flaking, as well as erosion that is caused by changes in temperature and humidity of the caves, and the deposition of salts. To restore (修复) a mural requires an all-rounder. Restorers should know painting, master the skills of a mason and have some knowledge of chemistry and physics, to be able to recognize the problems and their corresponding causes and deliver a solution. They must also select proper materials and tools, and conduct experiments, before formally carrying out the restoration and evaluating the effect afterward.
The restoration should respect the original work and aim to maintain the murals rather than repaint them. When the restorers find some parts of murals missing or fading away, they never repaint them to create a "perfect" appearance in restoration. "Cultural relics are witnesses of history," explains Su. "When you pursue the so-called intact (完好无损的) look for artistic reasons, you will lose their key meaning."
Cave conservation is about continuously solving problems. "It needs a long-term research to letter preserve the caves, over a much wider time span that goes beyond our lifetimes," Su says. But at least, they can keep the current look of the murals for as long as possible.
