
Contents
24.1.02
AOAC Official Method 976.28
Detection of Fingerprints (Latent) on Papers: Chemical Development Method
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Published:January 2023
Cite
Detection of Fingerprints (Latent) on Papers: Chemical Development Method', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1976
Final Action 1992
(Applicable to forced development of latent images deposited on bond and newsprint papers.)
Apparatus and Reagent
...
Pretreatment
(If evidence contains handwriting, printing, or typewriting to be examined by document examiner, protect area by brushing pretreatment, allowing for migration of ninhydrin solution. In general, spray large objects.)
Perform one of following pretreatments on papers:
...
Discard ninhydrin solution in flat dish. Return ninhydrin spraying solution to supply bottle for future use.
Development
Fill steam iron with H2O and turn heat indicator to “Steam.” Place papers on clean blotter. When steam is being ejected from sole plate holes, hold iron ca 1 in. (2.5 cm) above papers and move iron around to distribute heat and steam evenly. Vary height above paper with rate steam is being projected beneath iron. Steam should just reach papers before rising to sole plate. Wipe sole plate frequently to prevent condensate from dripping on paper. Images will begin to develop in ca 45 s and continue to intensify until plum or purple color is obtained. Move paper to clean blotter and let air dry; as alternative, after steam development of prints, shut off steam, wipe bottom of iron free of moisture, and then lightly pass iron over developed prints to enhance images. (Use caution not to burn or scorch papers.) Continue with each paper until all have been treated. When papers are dry, place each in appropriately labeled envelope or plastic protector, handling with tweezers.
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