A Guide to Distraction
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Fingerprints left on porous surfaces (unfinished wood, paper, cardboard) can last for up to forty years unless disturbed by water. Even then, however, some contaminate transfer prints may remain. 

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Fingerprints left on porous surfaces (unfinished wood, paper, cardboard) can last for up to forty years unless disturbed by water. Even then, however, some contaminate transfer prints may remain.