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At one end of the spectrum, relatively harmless stink bombs consist of , which can be broken by throwing against a hard surface or by crushing under one's shoe sole, thus releasing the odorous liquid contained therein. At the other end of the spectrum, the governments of and Tear Gas , stink bombs are believed not to be dangerous, and they are effective at low concentrations. The most effective stink bombs are those that contain a mixture of several stenches of biological origins. The biological odors used – Vomit , Human Waste , Body Odor s, burnt hair, and Rotting Garbage – are found universally revolting by people of all cultures. A mixture of various odors is more effective over time than a single odor, because it is much easier to acclimate to individual smells; a mixture therefore lasts longer and offers a greater impact. The s and Air Freshener s. Another one, " Who Me? ", is a mixture of five sulfur-containing chemicals and smells like rotting food and carcasses. "Who-me?" was designed during World War II , for use by the French Resistance to humiliate the German soldiers. CHEMICALS USED Typically, lower molecular weight volatile organic compounds are used. Generally the higher molecular weight for a given class of compounds, the lower volatility and initial concentration but the longer persistence. It should be noted that some chemicals (typically thiols) have a certain concentration threshold over which the smell is not perceived significantly stronger; therefore a lower-volatility compound is capable of providing comparable stench intensity to a higher-volatility compound, but for longer time. Another issue is the operating temperature, on which the compound's volatility strongly depends. Care should be taken as some compounds tend to be toxic in higher concentrations. The most often encountered compounds are:
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