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):
http://ift.tt/1xmOzQ4
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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