she carried out a study that involved the collection of thousands of tear gas canisters fired by venezuelan authorities in 2014. she stated that the majority of canisters used the main component cs gas, supplied by cóndor of brazil, which meets geneva convention requirements, but that 72% of the tear gas used was expired and other canisters produced in venezuela by cavim did not show adequate labels or expiration dates. following the expiration of tear gas, she notes that it "breaks down into cyanide oxide, phosgenes and nitrogens that are extremely dangerous". kräuter has advised against the use of vinegar to neutralize the effects of tear gas since it is an acid, instead recommending the use of sodium bicarbonate or antacids such as maalox.