Forensics - chemical treatment
- Created by: Ashlee
- Created on: 01-05-15 16:21
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- chemical treatment unit
- iso standards
- iso17025 accredited
- quality management system
- nationally recognised
- recognition of competence
- transparent system of work to the same standards following policies and procedures
- looking for..
- fats/lipids
- water
- amino acids
- salt
- other contaminants - drugs, food, paint
- constituents of sweat
- exhibit types
- porous
- newspapers, boxes, money, letters, clothes
- non-porous
- guns, weapons, credit cards, plastic bags
- porous
- type of treatments
- destructive
- non-destructive
- light sources
- crime lite
- schott light
- quaser
- laser
- coloured light optimises ridge detail
- flourescence
- materials absorb light on certain wavelengths/colour and re-emit that light at lower intensity
- filter required to cut out original light
- treatments
- ninhydrin
- high-contrast purple that’s readily visible when applied
- DFO
- makes fingerprints glow when they are lit by blue-green light
- ethyl cyanoacrylate/superglue
- reacts with the traces of amino acids, fatty acids, and proteins to produce a visible, sticky white material that forms along the ridges of the fingerprint
- fluorescent dyes
- superfume
- powder suspension
- aluminium powder
- black or jet blackmagnetic powder
- black granular powder
- protein stains
- coomassie blue
- Crowle’s double stain
- vacuum metal deposition/ VMD
- tiny amounts of gold and zinc metallic thin film coatings are evaporated onto flexible non-porous substrates
- physical developer/ VD
- document analysis
- ninhydrin
- iso standards
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