I'm not so sure of that, but I definately need a high purity agent, I am going to improvise a distillation setup and distill the finished mustard two, maybe three or four times, it's for sensitive organic chemistry
I have no wish whatever to use it as a blister agent, only for use as an alkylating reagent in atual synthesis, in this case mustard is no longer a chemical weapon, but just an extremely nasty synthesis reagent