An ancient book is stamped with someone's book seal, which means that the book has been hidden by someone. With the long history, the number of Tibetan seals is increasing, from which we can see the origin of literature collection. Most famous bibliophiles have books handed down from generation to generation. By comparing the book catalogue with the book stamp, it is helpful to check the version of a book. However, there is a difference between the authenticity of Tibetan seal and the authenticity of Tibetan seal. If conditions permit, we can compare the authenticity of Tibetan printing, carefully examine the printing method and the color of printing pad, and distinguish them.
Proofreading and proofreading of ancient books are often proofread and annotated by predecessors. Inscriptions and postscript often contain bibliographies and edition materials, which are helpful for the identification of ancient books. It is necessary to analyze the proofreading inscriptions and postscript, and determine its credibility from its own quality, who wrote it, content and font, so as to distinguish authenticity.
There are many records about lettering in various documents. Some bibliographies and notes often describe the writing and circulation of documents. Some chronicles of local art and literature include catalogues of local engraved books. Some writings, such as Wang Guowei's Guan Lin (Volume 2 1) and Yuan Zhen Ben Zhu, have recognized that Yuan Zhen Ben has the preface of Wang Qing's Zi Zhu, but it is not an engraving of Yuan Xing Wen Bu. These are all useful circumstantial evidence.