|MadSci Network: General Biology|
In the Book written by Dr. Peter DeForest, R. E. Gaensslen and Henry C. Lee Forensic Science, An Introduction to Criminalistics (McGraw-Hill Book Co. NY 1983) there are at least nine different techniques for visualizing Latent Fingerprints. 1.) Physical- Powder dusting 2.) Oblique Lighting & Photography 3.) Laser 4.) X-ray 5.) Chemical Iodine fuming 6.) Ninhydrin 7.) Silver nitrate 8.) Fluorescamine, o-phthalaldehyde, dansyl chloride 9.) Nitric acid, Hydrofluoric acid The choice of technique depends upon the type of surface that is being investigated. For example on smooth, nonporous surfaces such as metal, glass, tile and finished woods the powder duting method can be used. The powder (there are many types) will adhere to fingerprint residues (fingerprints are composed of water 98.5%, and solid material 1.5% = Lactic acid, fatty acids, Riboflavin, glucose, ammonia, peptides, Sodium etc.) On paper Silver Nitrate can be the method of choice. Good Luck in your work! Mike Doskotz
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