hartpaul wrote:I think what you would need to do is photograph the stamp under a light that makes the ink transparent.
Unless the image is captured in camera you cannot see what has not been captured .
Ie taking a photo of a car and and placing that in PSP X4 in layers will not allow you to open the boot / trunk and see what is inside,
hartpaul wrote:If the ink is black india ink then probably out of luck.
http://en.wikipedia.org/wiki/India_ink . India ink is essentially lampblack , (carbon) and only way to make carbon transparent is to turn it into diamond at high pressures and temperatures. If it is very thin, then the underlying inks may be made to flouresce - try a black light . ultraviolet light, Don't know what wavelength you would need however. Might be a lost cause apart from very carefullt abrading the india ink off which may damage what you are trying to preserve anyway.
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