Have some knowledge of this nasty stuff as my unit (No. 1340 [ Special Duty ] Flight , RAF Cannanore) was tasked to spray and drop the liquid mustard on the ranges of the Chemical Defence Research Establishment (a tropical offshoot of Porton Down).
My involvement starts on "Pilots Brevet" Thread, page 152, #3046, and continues sporadically from then on. An interesting twelve months spanning the end of the war, with the cherry on the cake being a romance which got nowhere ! Ah, well .....
Danny.