PREVIEW
... st department to use photosensitive materials for investigation purposes, which is quite surprising, but it is indeed the case.
Since the invention of mercury lamps, some photosensitive materials and their effects have primarily been used in the printing and dyeing industries. Both the Federal Tax Bureau and the Federation Coinage Company extensively use these materials, to the extent that sometimes people don't realize that the bills and coins in their hands have already been marked. ...
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