All the materials are rough, almost not smoke, but clods. If you knock with your hand, your voice will be hoarse, your body will be gray, your ink pattern will be rough, and your ink will be poor. These are the characteristics of counterfeit products. There is also a counterfeit product, which is fake ink made of a kind of carbon spar and a kind of stone. How to identify imitations? Mohist school imitated Ming ink in Qing Dynasty. One way is to indicate only the year, not the name of mohists. The other is to mark only the time when a Mohist imitated a Mohist in the Ming Dynasty. There are both imitators' own names and imitators' names, in order to promote themselves rather than deceive people. So someone dug up the original name of the fine ink made in the early Qing Dynasty, filled it with ink wax, and polished it with seals, year models and a little gold. This imitation is not easy to identify.

There are many kinds of inks, and the practical natural color inks are not only numerous, but also roughly the same in shape. We can identify whether the front and back of the ink are engraved with words and patterns (the name of the ink). Whether there is a manufacturer's name on the left and right. The time is also engraved on the side, and the words "Super Lacquer Smoke", "Lacquer Smoke", "Top Smoke" and "Tung Oil Smoke" are engraved on the top of the ink, indicating that Mo Ding belongs to the category of oily smoke and ink; The words "Yellow Mountain pine smoke", "large volume pine smoke" and "pine smoke" are engraved, indicating that Mo Ding belongs to the category of pine smoke; Engraved with the words "full smoke", "fine smoke" and "clean smoke", the ink belongs to the category of carbon black ink.

In short, Tibetan appraisers need to have considerable knowledge and experience. First of all, it is required to be familiar with the development and evolution history of the origin of Gu Mo, know the main origin of ancient famous ink and the surname of famous Mohist, and have a certain understanding of the famous ink patterns of famous Mohist.

In addition, there are obvious differences between new ink and old ink in texture. The new ink is gray, although it is thick but not moist, but the old ink is pure black and moist, with pure black color and strong color sense. Because new ink is often uneven with glue, its ink color is uneven. Due to the rigorous preparation method and long storage time, the glue of the old ink is naturally uniform, and its black is flat and does not stick to the pen. The smell of new ink is dry, and the old ink has its own quaint fragrance, showing an quaint tone.