Xuan writing brush Xuan writing brush Xuan writing brush or Xuanbi (), is a type of ink brush made in Anhui Province, China. Xuan brushes are often mentioned together with the famous Xuan paper - a kind of writing paper (rice-paper). The ink brushes are normally made in Jingxian County (currently Jing County) of Anhui Province. In ancient times, Jingxian County was under the jurisdiction of Xuanzhou Prefecture (宣州府; Xuān-Zhōu Fǔ; currently Xuancheng), so its name bears the character "Xuan" (Xuān). The Xuan brushes gained popularity in Jin Dynasty (256-420) among classic scholars, governmental officials, calligraphists and painters. During the Tang Dynasty (618-907)
Blotting paper however filter paper is usually used for litmus strips, generally to allow for the property of diffusion. Drugs active in microgram range, most notably LSD, are commonly distributed on blotting paper. A liquid solution of the drug is applied to the blotting paper, which commonly is perforated into individual doses and artfully decorated with what is known as blotter art. Vanity blotter is blotter art that hasn't been exposed to LSD and is usually sold as a collectible, although inevitably much of this art ends up in illegal distribution. The artwork is printed onto blotter paper and then sometimes perforated