Xuan paper is a type of paper that goes back to the Tang Dynasty and refers to the town where the paper was originally produced.
It is made out of a specific type of tree bark (and other natural material) which is put through an extensive process which includes non-destructively harvesting the tree bark, washing, pulping, drying, and cutting. Xuan paper is still typically made by hand and requires incredible precision and skill from the workers.
Xuan paper can come as raw (untreated and absorbent), sized (coated with alum and moisture-resistant), and semi-sized (partial alum coating).
To read more extensively about Xuan Paper, click here.