The quality of developed finger marks on glass surfaces after
immediate development was excellent as two thirds of developed
marks were good for identification, and the remaining
third were suitable for further examination (Table 1). After
hour-long exposure to water, just over a half of marks were
suitable for identification, compared to just under a half of finger
marks after one day. After one week no usable finger mark
was developed. Despite the simplicity of the procedure care had
to be taken not to put too much of the fingerprint powder on
the finger mark since the marks were very sensitive. Marks
can easily get smudged and thus unusable. The results showed
that the fingerprint powder used is not suitable for developing