Study: best face mask materials, from an actual st
Post# of 716
https://www.yahoo.com/huffpost/best-coronavir...00624.html
Please note that they mention in passing "shop towels" but do not elaborate on that.
Some women who were making face masks bought a device to test effectiveness of filtration, and they found that the non-woven blue shop towels of several brands were almost as effective as N95 masks, when used with TWO layers. However a caveat: the Scott brand of shop towels DID NOT WORK.