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e scientific team has been analyzing particles removed from the clip-on tie left behind by Cooper after he hijacked a Northwest Orient passenger jet in November 1971.
A powerful electron microscope located more than 100,000 particles on old the J.C. Penney tie. The team has identified particles like Cerium, Strontium Sulfide, and pure titanium.
Occam's razor would tell us that it's unlikely to be found in any second hand store as a donation.