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Group 1 Topic: Forensics Text books I could find no good books in the Chemistry library. There were a couple in Health Sciences. I have checked them out. 1. Saferstein....This is an excellent book. It gives a very complete analysis of modern methods. I found the diagrams very useful. It is recent, 1999 edition 2. Ramirez et al..This is a very old book, 1988. Don't bother look at it. It did have a cool picture of a crime scene (p98) .3. Rowe, Dee and Kaylor This is also a good textbook. Has procedures to do things and stuff
Topic: Fingerprints Hello everyone. I found an article at Woodruff Library that may be very beneficial in taking Fingerprints and methods to develop them. I forgot to write down the reference number, but it is in the Government Documents section of the library with a call number of about: J1.14/2:F..... Here is what I found (I'll bring it to class): Powdering and Lifting Latent Impressions: Some precautions for powdering: *no attempt should be made to brush or apply powder to prints in dust or bloody prints, because it would destroy them. The object must be dried. *When the latent print is visible, photograph it with a Fingerprint Camera. Powdering: *either gray powder or black powder is adequate for printing. Gray powder is good for dark surfaces and Black is good for light surfaces. *Brush lightly over a latent-bearing surface. The powder will cling to grease or moisture from the ridges of the print. *Be sure to place a very small amount of powder. Once the contour of the print is visible, make brush strokes in the direction of the ridges. *Other powders like dragons blood powder, gold powder and bronze can be used too. Lifting *Lifting should be done after photographing. Rubber and Transparent tape are available for this (Black or white rubber tape is good also). *Cut a piece of tape sufficiently large to cover the entire print *The tape should be pressed firmly and evenly. Be careful not to shift or buckle the tape. * Peel the tape gently from the surface I believe that the investigator would compare these fingerprints with those of the suspect or the victim
There are other chemical methods to develop impressions on various surfaces. Ill just post a summary of it because it is too long to post. *Iodine method for treatment of prints that contain oil and fat. The iodine vapor Allows the ridges of the fingerprint to appear yellowish-brown against the Background *Ninhydrin Method This is dependent on traces of amino acids which are present in perspiration of the Victim or suspect *Silver Nitrate method The is dependent on the reaction between sodium chloride (salt from perspiration) And silver nitrate to form silver chloride Cyanoacrylate (Glue) process *This vapor can be used to develop prints on hard surfaces like plastic or other pliable plastics. It deals with polymerization Gentian Violet/Crystal Violet Process *This is used to develop prints by staining nonliving epidermal cells, perspiration or other matter left by an individual touching almost any type of surface. |