Seal symbols on ancient official documents, paintings and books in China. After the calligraphy works are signed, the whole creation is completed. Its significance is to show the owner's ownership, right to use or recognition of the stamped object. The popular meaning is "seal", which is the last key step of calligraphy and painting. This is a unique art in China. Hot stamping began in Su Dongpo in the Northern Song Dynasty and has a history of 1000 years. A painting and calligraphy work can be "icing on the cake" if printed properly, otherwise it will be self-defeating.