Font: Chinese font refers to Oracle Bone Inscriptions, inscriptions on bronze, big seal script, small seal script, official script, Wei Ti, regular script, running script and cursive script. , and there is no need to identify the generation date.

Handwriting identification: that's the job of public security and justice. High-level public security departments (such as provincial and provincial public security departments) generally have specialized handwriting identification institutions or personnel.

If the topic expresses the above meaning and is the need of some things, then you need the judicial department to submit it to the appraisal agency for appraisal. After you find an agency to do it yourself, people will not accept it.

If you mean ancient calligraphy and painting appraisal, it can be used for celebrity calligraphy and painting. Calligraphy and painting appraisal institutions can date the ancient calligraphy and painting of ordinary people, such as calligraphy and painting mounted in the middle and early Qing Dynasty.

Whether it comes from the same person depends entirely on comparison. Unless it is a celebrity calligraphy and painting, please note that it must be a "celebrity calligraphy and painting", otherwise no one can identify whether an unknown person's old calligraphy and painting is written by one person-because there is no comparative data.