Does Zhang Jun's calligraphy require the master to distinguish between true and false?

First of all, look at the paper, touch the water drops on the paper with your hands to see if it is Xuan paper. If it is rice paper, the water will spread immediately. Then smell the ink. Most painters use a German pavilion and red star ink. These inks are all spiced, and they taste better when asked. Moreover, the ink will not blister and fall off after writing, and you can also touch it by hand. Words written in ink feel different from printed words, and printed words are particularly flat. The most obvious thing is that there is a small cross mark on the corner of the printed matter, and the paper is thicker. Here are some suggestions for you. You can't tell by looking at the photos. You need to identify them yourself.