An Dao, 59, has been working at Chengdu Gold and Silver Products Factory for more than 40 years after graduating from high school.

Silver drawing, together with Shu embroidery, Shu brocade, lacquerware and bamboo weaving, are known as the "five treasures" of intangible cultural heritage in Chengdu, Southwest China's Sichuan province. In 2008, the technique was added to the National Intangible Cultural Heritage List.