Product Description
Prussian Guard Mask is a four-layered particulate respirator. The first (outside) layer of phthalocyanine and Prussian blue dye absorbs or prevents contaminants, and second layer (Melt blown non-woven fabrics), third layer (antivirus non-woven fabrics) and forth layer (PP non-woven fabrics) prevents virus and pollen. Large size.
http://www.daiwabo.co.jp/catalog/pgmask/index.html

