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Xu enjoyed massive support from art collectors across Asia. Between 1939 and 1941, he held solo exhibitions in Singapore, India and Malaya (Penang, Kuala Lumpur and Ipoh) to help raise funds for the war relief effort in China. In one war benefit exhibition in March 1939, Xu held a group exhibition with Chinese ink painting masters Ren Bonian and Qi Baishi, and showcased 171 works of art at the Victoria Memorial Hall.