With immediate development just under a half of usable
marks were developed on glass surfaces; the same is true of
marks usable for further examination. After 1 h exposure to
water, the majority of traces were suitable for identification.
After 24 h of exposure to the effects of water, over a half
of marks suitable for identification were developed, while
one third of developed marks were unusable. The results of
developed prints after 48 and 168 h exposure to water were
quite similar (Table 1). Some of the results can be seen in
Fig. 2.