1, handwriting authenticity: the characteristics of writing age, style, technique, strokes, structure, etc., and its authenticity can be judged by careful observation and comparison.
2, paper and ink and other materials: to judge the quality of paper and ink, whether it conforms to the characteristics of the author or the times.
3. Printing, fake goods, etc. It is necessary to judge whether there are similar works on the market at present, whether there are prints, fakes and other fakes.
4. Collection history: It is necessary to know the history, use and preservation environment of the collection to judge its authenticity and value.