A thangka composed of strung pearls is kept in Dradrug Monastery in Shannan. Thangka is a special art of Tibet. The material used for thangka is linen cloth or coarse woolen fabric or silk or paper. The cloth needs to be prepared first and then the artist works out the sketches of the portraits with charcoal sticks. The drawing usually begins at the center.
Colouring comes last.
The pigments used come from non-transparent minerals and plants such as malachite and cinnabar. They are mixed with animal glue and ox bile to make the lustre stay. There are many schools of painting which may be classified as the Eastern Tibetan, the Middle Tibetan, the Western Tibetan. The Eastern Tibetan was the oldest and heavily influenced by those of the Han nationality. This style is individualistic and probably too free for the taste of Buddhists.