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... e photosensitive materials for investigative work, which was surprising but true.
Since the invention of the mercury lamp, some photosensitive materials and their functions have primarily been used in the printing and dyeing industries. The Federal Tax Bureau and the Federal Mint also extensively used these photosensitive materials, to the extent that sometimes people weren't even aware that the currency and coins in their hands were marked.
And with a simple exposure under a UV ...
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