AngryNick writes "The Washington Post reports today on the declassification of some of the CIA's oldest secrets: Do you want to open sealed envelopes without getting caught? According to one of the six oldest classified documents in possession of the Central Intelligence Agency: 'Mix 5 drams copper acetol arsenate. 3 ounces acetone and add 1 pint amyl alcohol (fusil-oil). Heat in water bath — steam rising will dissolve the sealing material of its mucilage, wax or oil.... Do not inhale fumes.'"
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