RenqQing CaiRang is the master of Thangka painting of China. He created a unique Tibetan painting method called Black Tang Convex Gold. The Thangka painting method is very complicated and time-consuming. The works of drawing need a painter 30% increase in workload and extend the painting cycle, which helps the number of the painter's works reduce significantly. The bumps on the surface of the painting are pure gold, using a great deal of gold, so the cost of this kind of thangka work is very high. You can imagine how precious it is. His works have a very high collection value. The artwork attracted the attention of many thangka collectors as soon as they were on the market.