Police once used a strange method called the paraffin wax test to catch criminals. It revealed gunpowder residue by turning blue when nitrates were present. For educational purposes only. credits: ashmontefalcooo, henayaaaa, desyryy7, projectneil1.029 #interestingfacts​ #technology​ #crime | Tech Today
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Police once used a strange method called the paraffin wax test to catc…
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