spartex, I knew exactly what he meant, you would have too if you know your stuff a well as every regular non-troll poster on this board. Fact is the blue masks or even just cloth masks, are not as effective as the N95's
but they are not "ineffective" as you stated. It's simple, and it was clear in his post that's what he was talking about.
There would be more material on all about covid on this board than you have read anywhere. Oh, and since you are still a Trump guy even though he has been ranked 45/45 by presidential historians, and since you didn't reply to ..