For forensic scientists, one of the most important parts of any investigations is finding fingerprints. Fingerprints are key parts in finding criminals, so it is vital that any invisible fingerprints are found!
Optical techniques such as ultraviolet light are the first step in detecting invisible fingerprints. Ultraviolet light can be used to find prints on any type of surface, but for some certain surfaces more techniques are needed. On a porous surface, no latent fingerprints might be found if the surface was wet when the print was left. If it was a dry porous surface, then metal salt or ninhydrin can be used to lift fingerprints. If you find a fingerprint on a dry, nonabsorbent surface, then you must sprinkle powder (white powder on dark surfaces, dark powder on light surfaces) and then lightly brush away excess powder to reveal the print. The print can be lifted using tape.
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| Fingerprint on tape |
I like how you included the pictures at the top and bottom, makes the reader have something to look at before and after reading the passage.
ReplyDeletei never thought of it that way Christine owo good idea
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