^^ toxic yes but if the reaction was run to completion and the stoichiometry correct than you should have elemental mercury, which is MUCH less toxic than the salts, due to solubility. But this aint the cause of black MDMA, or at least I should hope not, because you would almost have to deliberately leave the reaction mess in there. But then again, peeps over in North American Drug Discussion keep going on about "Brown Sugar" MDMA making the rounds and judging by the pics it looked pretty fricking nasty. But they seem to think its the bees knees........it dismays me that producers cant even be bothered to recrystallize their products...