Forensics - fibres
- Created by: Ashlee
- Created on: 28-04-15 16:55
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- Textile fibres
- principles
- locards exchange
- direct and indirect transfer
- A --> B or A --> B --> C
- primary/secondary transfer
- avoid contamination
- retention of transferred fibres
- shed well = retain well
- persistence = ****
- time
- washing
- activity
- textile
- locards exchange
- classification
- natural
- animal/vegetable/mineral
- cotton/wool/silk
- manmade
- natural and synthetic materials not in group
- carbon/ textile glass/ metal/ cellulose/ viscose/ modal/ acetate
- synthetic polymer fibres
- 2 materials mixed
- natural
- analysis
- microscope
- size
- colour
- shape/cross section
- fibre type
- lustre
- microscope
- identification
- round = nylon/polyester
- bean = acrylic
- dogbone = acrylic
- multilobal = viscose
- triangular = silk
- trilobal = nylon
- lobular = acetate
- collection
- tapings/handpicking
- only interested in extraneous fibres
- cover whole surface area
- not fibres from original item that fibres are collected from
- light source - UV, laser, high intensity
- scraping
- vacuuming
- further analysis/comparison
- tape search against control
- birefringence
- dye classification
- microspectophotometry
- thin layer chromotography
- fourier transform infrared spectroscopy
- interpretation/probative value
- matching fibres?
- number of fibres significant?
- common?
- unique?
- likelihood of finding fibre by chance?
- principles
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