Thang-ga is a unique form of painting art in Tibetan culture with distinctive national and religious characteristics as well as exceptional artistic style. Traditionally, dyes used are such valuable minerals and gemstones as gold, silver, pearl, agate etc. and plants like saffron, rhubarb etc. And because of these natural dyes, the painting will have gorgeous color and can be preserved for hundreds of years without any change in color. As a result, Thang-ga is known as the art treasure of Chinese ethnic painting, and Tibetan encyclopedia, also the precious intangible cultural heritage in Chinese folk art.