In pharmacy, etc., charta emporetica was a kind of paper made very soft and porous, used as a filter. It was also used as packing paper.
This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.
References
Charta emporetica Wikipedia(Text) CC BY-SA