An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
An ancient mural undergoes restoration work in a room at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)
A specialist goes through a series of checks before entering a room where relics undergo restoration at the Shaanxi History Museum in Xi'an, Northwest China's Shaanxi Province, Jan. 16, 2019. Visitors can view the process through a glass window. (Photo: China News Service/Zhang Yuan)