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In page Cocoa bean:

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Cocoa beans are traditionally shipped and stored in burlap sacks, in which the beans are susceptible to pest attacks.[1] Fumigation with methyl bromide was to be phased out globally by 2015. Additional cocoa protection techniques for shipping and storage include the application of pyrenoids[citation needed], as well as hermetic storage in sealed bags or containers with lowered oxygen concentrations.[2] Safe long-term storage facilitates the trading of cocoa products at commodity exchanges.