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Crude caffeine, freshly extracted from coffee beans, has a pungent odor. After the impurities are removed, it will be white and odorless.
Dan Charles/NPR
<img src="http://media.npr.org/assets/img/2016/02/24/caffeinefactory_custom-0e4aa81c7ebc73a58bf4297e3291fb6e2c9e2dfd-s1000.jpg" title="Boris Wheatley, a manager at Atlantic Coffee Solutions, inspects two tanks filled with a mixture of hot water and caffeine. The water will be evaporated to obtain crude caffeine powder." alt="Boris Wheatley, a manager at Atlantic Coffee Solutions, inspects two tanks filled with a mixture of hot water and caffeine. The water will be evaporated to obtain crude caffeine pow…