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Longevity of lifted footprints - Lifted shoe prints
(dust marks) may slowly fade in time. For very weak
prints this may be noticeable after storing for a few
days. This will depend on temperature. The lower the
temperature, the slower the fading. This, however,
should not be a concern since lifted footprints can
easily be photographed after removing the cover sheet.
Oblique lighting will show details not visible before
photography. So far, no materials are known to us that
faded on the lifter surface before satisfactory
photographs had been taken. |
