Chemical Treatment Unit

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  • Created by: Ashlee
  • Created on: 01-05-15 18:18
What are the two exhibit types?
Porous and non-porous
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Name some porous materials commonly treated?
Letters, clothes, newspapers, money, paper
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Name some non-porous materials commonly treated?
Credit cards, weapons, guns, plastic bags
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What is the ISO standard for lab work?
ISO 17025
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What are ISO standards?
Nationally recognised; recognition of competence; quality management system; transparent system of work; everyone follows same standards; policies and procedures
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Name some light sources used to recover evidence?
Crime lite; schott light; laser; coloured light; fluorescence
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Why is fluorescence used?
Materials absorb light on certain wavelengths/ colours and re-emit them at a lower intensity so they become visible
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What are the 2 types of different treatment?
Destructive and non-destructive
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What is looked for when examining an exhibit at CTU?
Constituents of sweat - amino acid, salt, water, fats/lipids - and other contaminants like drugs, food and paint
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Name the different treatments used.
Superfume; ninhydrin; DFO; ethylcyanoacrylate/superglue; fluorescent dyes; vacuum metal deposition/VMD; physical developer/VD; document analysis; protein stains; powder suspension
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What is ninhydrin?
Chemical used which makes marks visible - high contrast purple
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What is DFO?
Makes fingerprints glow bright yellow when lit with a blue/green light
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What is ethylcyanoacrylate?
Superglue - reacts with traces of lipids, fatty acids and proteins to leave sticky white material that forms along ridges of fingerprints
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What is vaccum metal deposition or VMD?
Thin film coatings of zinc and gold evaporate onto non-porous substrates making them visible
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What are 2 protein stains used?
Coomassie blue and Crowle's double stain
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How do protein stains work?
Reacts with proteins in fingerprints/skin etc..
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Name some powder suspensions.
Aluminium powder; black or jet black magnetic powder and black granular powder
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Other cards in this set

Card 2

Front

Name some porous materials commonly treated?

Back

Letters, clothes, newspapers, money, paper

Card 3

Front

Name some non-porous materials commonly treated?

Back

Preview of the front of card 3

Card 4

Front

What is the ISO standard for lab work?

Back

Preview of the front of card 4

Card 5

Front

What are ISO standards?

Back

Preview of the front of card 5
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