What is the most dangerous liquid you have ever experimented with?

Question: What is the most dangerous liquid you have ever experimented with?
- Keywords:
  experiment,
  research,
  safety
Asked by Ocean to Nathan on 11 Feb 2015.
- Nathan Quinlan answered on 11 Feb 2015:
  
  Hello Ocean. Nothing very nasty. One of the biggest safety worries in my lab is actually a water spill, which could cause an electrical accident…

Question: What is the most dangerous liquid you have ever experimented with?