Economy
Watermarks rely on varying thicknesses in the paper currency
HERE’S THE INTERESTING PART
That ghost face you see when holding a bill up to the light isn't printed ink; it is actually a masterful manipulation of paper density. During the manufacturing process, the cotton mesh is purposely thinned out in exact shapes, allowing more light to pass through specific spots. It is literal structural engineering embedded into a piece of fabric just to keep you honest.
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