Check out this process: https://tucson.com/news/local/watch-now-ua-lab-casts-mirrors-for-the-worlds-largest-telescope/video_04d8cb93-e800-5bd7-b46c-9d5fcf70991a

Check out this process: https://tucson.com/news/local/watch-now-ua-lab-casts-mirrors-for-the-worlds-largest-telescope/video_04d8cb93-e800-5bd7-b46c-9d5fcf70991a.html https://tucson.com/news/local/watch-now-ua-lab-casts-mirrors... There are some other videos shot in the pandemic--it's a bit of good fortune that safety controls against silicosis are also super effective against respiratory pathogens.