Fingerprint - oil, sweat and amino acids.
Fingerprints are unique, even for twins. - why?
Are DNA fingerprinting for twins the same or different? why?
What is DNA fingerprinting?
Fingerprints do not change with age.
Fingerprints can be burnt off by acid. Ouch.
Fingerprint classification system: whorls, arches, loops, etc.
Latent prints can be found on porous and non-absorbent materials. --> how is it going to affect the quality of the fingerprint.
Porous materials - iodine fuming, fluorescent and UV ray
Non-absorbent - Superglue fuming, powder dusting, silver nitrate - why the different methods.
Powder dusting:
-use the colour that contrasts the best with the background.
-black (charcoal) and gray (aluminium powder) usually sufficient
-used for hard and non-absorbent surfaces; powders will stick to the oil residues left on fingerprint
Magnetic powder dusting:
-magnetic sensitive powder spread with the use of magnet; lessen the risk of damaging the sample as there is no actual contact between the brush and the fingerprint.
Why twins have different fingerprints:
Bring camera and macbook for tomorrow!! Camera used to photograph iodine developed fingerprint.
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