10/31 Phones on front table Turn in the Case of the Floral ...10/31 Phones on front table Turn in...
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October 31, 2017 10/31 Phones on front table Turn in the Case of the Floral Killer - extra homework Pick up new packet: Unit D: Fibers and Fiber Lab HW: Fiber vocab due Thursday 11/2 TEST Unit C & D: Wed 11/8
Transcript of 10/31 Phones on front table Turn in the Case of the Floral ...10/31 Phones on front table Turn in...
October 31, 2017
10/31 Phones on front table Turn in the Case of the Floral Killer - extra homeworkPick up new packet: Unit D: Fibers and Fiber Lab
HW: Fiber vocab due Thursday 11/2 TEST Unit C & D: Wed 11/8
October 31, 2017
NeverIndividual
Trace
Class
Circumstantial
October 31, 2017
clothingcarpetfurniture
ropeinsulationlinens (sheets, bIankets)
victim suspect
October 31, 2017
pluck w/ tweezerssticky tapespecial vacuum
prevent loss or contamination
October 31, 2017
Wayne Williams(serial killer in Atlanta) - house and car carpet fibers used as evidence
Then (early '80's)
Now (2010)
documentation collectionuniqueness
type, dye lot type of weavematched Suspect
use of probability product rule(multiply)
October 31, 2017
- Save some
BurningSolubilityin a solvent(acetone,benzene)
- Polarizing light microscopyIR spectroscopy
absorption orreflection of IR
-florescent microscope (dyes)
October 31, 2017
HW: vocab for fibers due by Thursday
Start on Fiber Lab - Microscope today - Burning tomorrow
Fibers Yarns
Textile(Fabric)
October 31, 2017
Microscope: complete data table - drawings should all be done under the same power - use colored pencils - draw just a few fibers, not the whole cluster - describe how yarn is twisted - one fiber may have cuticle scales - make note of this because it will help with identification - after identifying unknown, you can ask if you are correct!
CottonAcetateWooIPolyesterRayonUnknown
