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Two centuries after the French people beheaded King Louis XVI and dipped their handkerchiefs in his blood, DNA analysis has thrown new doubt on the authenticity of one such rag kept as a morbid souvenir. Researchers have been trying for years to verify a claim imprinted on the calabash that: "On January 21, Maximilien Bourdaloue dipped his handkerchief in the blood of Louis XVI after his decapitation" in Paris in 1793. In 2010, a study said DNA analysis of blood traces found inside the ornate vegetable revealed a match for someone of Louis' description, including his blue eyes. One of the authors of that paper, Carles Lalueza-Fox of the Institute of Evolutionary Biology in Barcelona, also participated in the latest study, which contradicts the blue-eyed finding.