The ink in a one dollar bill is surprisingly thick under the microscope
https://www-newz.blogspot.com/2015/02/the-ink-in-one-dollar-bill-is.html
The light angle helps, no doubt, but the depth of the ink in this microscope photo of a one dollar bill is impressive. Keep in mind that the dollar bill is only 0.0043 inches thick (o.1 millimeters):
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