Being the genius that I am, I decided to test the seal of my M-10. This may have been the worst mistake of my life. When I was sure the mask fit me correctly, I tool it off and immediately began coughing. Curious as to what would've caused this, I brought a flashlight up to it and, WADDAYAH KNOW?! A disturbingly high amount of white particulates near the exhale valves. Just wondering if I'm gonna be alright or not. I had the M-10 on for about half a minute, by the way... Not even sure if this is the right place to ask (ha) but I'm kinda paranoid at the moment.