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08-02-2016, 07:13 PM #5
I can confirm this, they still use microdotting in photocopiers to trace bank note copying. The machines I work on use the yellow toner to spray practically invisible microdot serial number identification. Anywhere there is white, if you get a microscope you can see the yellow microdots. This is how they track which machine copied the bank note. Considering 99.9 percent of photocopiers are under a management agreement, tracking them down is pretty easy.
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