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Sep 13, 2010
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starstarstarstarstar 		ESDA, oblique lighting
by: Anonymous

There are different methods to do this. The easiest one is to observe the document in oblique lighting. Probably more efficient would be to use an ESDA device (Electrostatic Detection Apparatus) which you can use to create an image of latent writing impressions. You'll find more information about this device at Foster & Freeman or with google...

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