As far as propellants go it is relatively safe. If you want dangerous, here you go: https://en.wikipedia.org/wiki/Chlorine_trifluoride#Rocket_propellant https:/

As far as propellants go it is relatively safe. If you want dangerous, here you go: https://en.wikipedia.org/wiki/Chlorine_trifluoride#Rocket_propellant https://en.wikipedia.org/wiki/Chlorine_trifluoride#Rocket_pr...