How to distinguish the creation age of calligraphy works?

1, depending on the material and material year, experts can tell. 2. Look at the signature of the work. 3, look at the background of the author's birth to scrutinize. In order to identify the imitation, you can look at the seal and calligraphy skills. Counterfeiters are eager to achieve calligraphy skills, and naturally they are not as good as the author. Although the copy is very similar, it is just a trick for laymen, and experts can understand it at a glance. The works of famous calligraphers are flowing in one go, and the brushwork is very old, which is beyond the reach of counterfeiters.