1) Iodine Fuming
2) Ridges and Pores Activity (wood glue)
3) Cyanoacrylate (Superglue) Fuming Method
4) Powder Dusting Method
Iodine Fuming!
Fingerprints can be seen using this method because natural body fats and oils in the larent print temporarily absorb the iodine vapours, resulintg in a change in colour, often from colourless to dark brown. However, this change fades after a while as the iodine that was absorbed eventually dissipated into the atmosphere.
Placing filter paper into the glass jar with iodine fumes:
Close-up:
Product (the one on the left is Audrey's and mine's on the right)
Cyanoacrylate (Superglue) Fuming Method
Superglues typically contain methylcyanocrylate or ethylcyanoacrylate which react with traces of amino acids, fatty acids and proteins in the latent fingerprint and the moisture in the air to produce a visible sticky white substance along the ridges of the fingerprint.
order of fingerprints: audrey's mine michelle ang's and heidi's
Ridges and Pores Activity
A friction or epidermal ridge is a raised porton of the skin on the fingers and toes. Impressions of fingerprints may be left behind on a surface by natural secretions of sweat from glands that are present in friction ridge skin.
When the glue is undried:
The dried version:
Last but not least, the powder dusting method!
Oils and perspiration from the common residue on finers that get transferred when a print is made. When the powder is applied to the suface with the print, it sticks to the oils and brings out the ridge patterns.
its now pasted onto my worksheet!
MY FINGERPRINT DATABASE!
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