Do not use non-absorbent machine-made paper with a smooth surface when practicing calligraphy. Raw Xuan is set as soon as you start writing, and the ink seeps out quickly and is difficult to master. Mature Xuan is suitable for fine brushwork paintings and can withstand layers of staining. The ink and color will not spread and have poor water absorption. Therefore, it is still recommended to use Shengxuan. ——Excerpted from Art Criticism Network