In the north sides of Jiyi Hall （集义殿）and Benren Hall（本仁殿）, there are two stone bases of bronze vats separately. At first I mistook them for dry wells because of the rare grey-brick plinth, thanks to the advice of a Weibo friend. When the bronze vats were removed, I am reminded of the Japanese dedication of copper and iron campaign in 1944. In response to the incident, the The Palace Museum conducted an inventory of 277 bronze vats in the Forbidden City. It includes: type 1: 98 pieces of bronze vats with Ming and Qing Dynasty manufacture signature mark; type 2: 125 pieces of bronze color similar to those made in the Ming Dynasty but without manufacture signature mark; type 3: 54 pieces of no identification and the style can not be judged to belong to the Ming Dynasty. Finally, on June 19, 1944, the Palace Museum handed over 54 bronze vats belonging to the third category of no identification to the Japanese army . As to whether these lost copper vats were included in the list of 54 unidentifiable copper vats, a check of the inventory at that time will make it clear. Another question remains to be answered. It is now generally accepted that there are 308 bronze vats in the Forbidden City, 31 of which are different from the 277 counted in 1944.
A Weibo friend mentioned that in 1944, the Hall of Literary Brilliance was still under the jurisdiction of the National Museum of Art, Peiping.