features for consideration will be the type of film, the
type and size of lights, the method of lighting (direct, side,
transmitted or reflected) and also whether or not filters are used.
Accordingly, there may be a wide variation of exposure time in
different cases.

The best approach for arriving at the proper exposure time is merely
to make a test exposure, develop the film, and from an examination
determine if it is underexposed or overexposed. Time the next exposure
accordingly, until satisfactory results are obtained.

As has been mentioned previously, when photographing the ridges on
fingers or skin, the ridge detail will be in reverse position, the
opposite from an inked impression made from the same skin or finger.
(This is true except in those cases in which the underside of the
epidermis is photographed.) Accordingly, when the negative is
printed, it should be printed gloss side to sensitive side of paper to
give the position comparable to an inked print made from the same skin
or finger. In order to avoid error or confusion a notation should be
made on the photograph of each finger, or, if they are cut and mounted
on a fingerprint card, point out that the position has been reversed
and that the prints are in their correct position for classifying and
searching. Otherwise, it is possible that the right hand may be
mistaken for the left hand and vice versa.

If the underside of the epidermis or outer skin is being photographed,
the negative should be printed in the normal manner, that is, emulsion
side of negative to sensitized side of paper. Here, reversal of
position is not necessary for when the ridge detail is viewed from the
underside it appears to be in the same position as the inked
impression normally is reflected on a fingerprint card.

Care should be taken to see that each photograph is labeled correctly
to indicate the finger it represents, such as right thumb, right
index, right ring, etc. It is imperative that no error occurs in such
labeling, inasmuch as it is highly probable that the resultant
classification would be incorrect and failure to make an
identification might very easily follow.

_Deceased infants_

The foregoing has dealt with the securing of fingerprints of unknown
deceased persons for identification purposes. The basis for such
action is the presumptive possibility that the unknowns had been
fingerprinted previously and through this medium might be identified.

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