A lab worker uses the Kastle-Meyer test, needing only a pinhead-sized specimen. Applying phenolphthalein, the chemical turns pink when mixed with blood. The test works, revealing crucial information. #thefbifiles #truecrime #crimeinvestigation #forensicevidence #unsolvedmystery #forensicscience #blooddetection #labtests #criminaljustice #evidence | The FBI Files
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Alan Giusti's Kastle-Meyer test confirms the presence of blood! The positive result after phenolphthalein application is a major breakthrough for Agent Eric Alpert. Now to trace its origin and understand why it matters. #BloodTest #ForensicScience #CriminalInvestigation #AgentAlpert #EvidenceAnalysis | Real Crime
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