Making a global sensation: Vanilla flavor, synthetic chemistry, and the meanings of purity.

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How did vanilla, once a rare luxury, become a global sensation? Rather than taking the vanilla flavor of vanilla beans as a pre-existing natural fact, this essay argues that the sensory experience that came to be recognized as vanilla was a hybrid artifact produced by an expanding global trade in a diverse set of pleasurable substances, including cured beans from artificially pollinated vanilla orchids, synthetic vanillin, sugar, and a far-flung miscellany of other botanical and chemical materials. Global trade and large-scale production resulted not in the production of a homogenous, stable commodity, but in a range of local vanillas, heterogeneous mixtures with a range of qualities and virtues. As local commercial and regulatory interests competed to define the origins, and thus the market value, of authentic vanilla flavor, scientific experts were called upon to adjudicate these rival claims. In the United States, these debates played out in the context of the 1906 Pure Food and Drug Act, where efforts to define and chemically enforce a 'standard' vanilla extract, in contradistinction from adulterated, 'imitation' extracts, clashed with the interests of makers and users of both synthetic and 'genuine' vanilla flavorings. As regulatory chemists grappled with the growing variety of vanillas, they were required to determine the appropriate chemical components of genuine vanilla, and consequently to delimit the subjective sensory effects proper to the flavor. Nonetheless, the materials, experiences, and meanings popularly associated with vanilla flavor continued to exceed the limits prescribed by officials.