The US started hearing about a substance that could be used to track the movements of any person who touches, or walks across, a contaminated surface. in 1963. It wasn’t
until 1984 that they got a sample of the stuff. A defecting agent revealed that powder containing both luminol and a substance called nitrophenyl pentadien (NPPD) had been applied to doorknobs, the floor mats of cars, and other surfaces that Americans living in Moscow had touched. They would then track or smear the substance over every surface they subsequently touched.
The US started hearing about a substance that could be used to track the movements of any person who touches, or walks across, a contaminated surface. in 1963. It wasn’t until 1984 that they got a sample of the stuff. A defecting agent revealed that powder containing both luminol and a substance called nitrophenyl pentadien (NPPD) had been applied to doorknobs, the floor mats of cars, and other surfaces that Americans living in Moscow had touched. They would then track or smear the substance over every surface they subsequently touched.
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