Pure HF is a gas and can be inhaled. It does bad things, Derek Lowe has a write up: https://www.science.org/content/blog-post/things-i-won-t-touch-1 https://www

Pure HF is a gas and can be inhaled. It does bad things, Derek Lowe has a write up: https://www.science.org/content/blog-post/things-i-won-t-touch-1 https://www.science.org/content/blog-post/things-i-won-t-tou... I'm not sure what concentration IGNS was using it in as I'm mercifully a computer person, but I had a friend who worked in their labs and took me through them one time :D