taggant

/ˈtæɡənt/
noun
  1. A microscopic particle or chemical marker added to a product (such as explosives, ink, or pharmaceuticals) to identify its source or verify its authenticity.
    • The company added a taggant to its ink so that counterfeit documents could be easily detected.
    • Forensic scientists analyzed the taggant in the explosive to trace it back to the manufacturer.
    • Each batch of medicine contains a unique taggant that helps prevent fake drugs from entering the market.
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