Because Mr. Qi Gong's works are expensive in the market, they naturally become the object of imitation and forgery by some lawless people. Before qigong died, fake calligraphy and painting were rampant. Not long ago, an auction house in Beijing actually sold 25 fakes, involving hundreds of thousands of yuan.
Distinguishing the authenticity of Qigong's calligraphy depends not only on his unique thin and hard brushwork, but also on his elegant and refined book spirit. We can often see the flaw of forgery from the seal of his works.
There are not many seals commonly used by Mr. Qi Gong, about a dozen. According to statistics, there are rectangular seal cutting Yin, square seal cutting Yin, square seal cutting Yin, private seal cutting Yin, square seal cutting Yin, square seal cutting Yang, square seal cutting Yang and Bai Yuan.