Assertion: vanillin's radiocarbon | /r/HasProperty | 14clevels than vanillin
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Source sentences:
text: One of the first detection methods relied on the fact that vanillin obtained from fresh vanilla pods had higher radiocarbon (14C) levels than vanillin from petrochemical sources (though it did not distinguish it from material obtained from fresh lignin); in response, the fakers added extra 14C to their vanillin.