30-meter-long thangka?painting displayed in Gansu

A 30-meter-long thangka scroll painting has been displayed at Gansu Provincial Museum in Lanzhou, northwest China's Gansu Province. The thangka scroll depicted the story of the Liangzhou Talk in history.　 　

Hand-painted thangka is actually a scroll painting with natural precious minerals as pigments. The theme is mainly about history, politics, economy, culture, clothing, architecture, and other fields.