Introduction to the authenticity of calligraphy and painting

Original Calligraphy and Painting, also known as Li Ji, is selected from Shen Kuo (Song)' s Bi Tan. The main content is: Li, a bachelor, likes collecting books. A Jin dynasty figure Copybook for calligraphy and his son Xu Li together. Chang 'an Yohito borrowed a copy from Mr. Li, stole it and presented it to Lu Gong Wen Yanbo, who mistook it for an original.