How to identify the authenticity of Bian Zenglin's calligraphy

Look at the appearance. Fake paintings and calligraphy works are mostly copied, and the lines of famous paintings can be identified by appearance, and then filled with ink, which is similar but not similar, ethereal, without the charm of painting soul, and paintings are often ethereal and vague, lacking aura. Bian Zenglin was born in a scholarly family and loved painting and calligraphy since childhood. At the age of six, he began to write Wang Xizhi's Preface to the Lanting Pavilion, and later learned the essence of Yan Zhenqing's Diligence Monument and other schools.