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AOAC Official Method 974.35 Detection of Fingerprints (Latent) on Objects

  • Published: 2013-09-24
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AOAC Official Method 974.35 Detection of Fingerprints (Latent) on Objects
Powder Brushing Method
First Action 1974
Final Action 1975
(Applicable to development of latent images deposited on nonporous surfaces within 120 h and not subjected to extreme temperature
or humidity changes.)
Pour small amount fingerprint powder (Hi-Fi Volcano, Sirchie Fingerprint Laboratories, Inc., Gravelly Hollow Rd, Medford, NJ 08055, or equivalent) into shallow dish or onto piece of paper. Pick up small amount with end of camel hair brush. Hold brush over surface to be dusted, and tap handle lightly to permit powder to drift onto surface. Brush surface lightly until image begins to appear.

Continue with light strokes, following ridge direction in pattern as it forms. Apply additional powder, if necessary, to obtain good contrast, but retain ridge detail. When sufficient detail and contrast are obtained, remove excess powder with ostrich feather duster. Preserve image by photographing and then taping over, leaving tape in place if practical. If not, pull off tape slowly and evenly, and place on 3 in (7.6 cm) ´ 5 in (12.7 cm) card of contrasting color.
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