Thank you for mentioning this. Basically if light shines through your mask, the virus can easily get through as well.
“Basically if light shines through your mask, the virus can easily get through as well.”
Even though I don’t wear them (except once when required to see my surgeon), I’ve been making masks for family and friends. I didn’t know that about light shining through, but had been using that as a kind of standard. I tried several patterns, but the one that was easiest, fit the best, and seemed the safest, had a pocket to insert a filter like paper towel (which is supposed to be excellent) or coffee filter.