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The Effect of Surface Temperature On Fingerprints!

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natalie aguilar

on 17 September 2016

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Transcript of The Effect of Surface Temperature On Fingerprints!

The Effect of Surface Temperature On Fingerprints!
If fingerprints are obtained form a surface with a lower temperature, then the fingerprints will be more clear than from the other surface temperatures
// A mark on a person's fingertip, used for identifying individuals.
Friction Ridges
// The skin on the surface of our palm and feet has many ridges
//increase the volume of sound
// move or cause to move continuously and rapidly
Patent Fingerprint
// fingerprints that are easily spotted without the use of magnesium powder, ultra violet ligts or chemicals that might assist in the visualisation of such a print, Are ussually found in glass, wooden doorframes, or paper.
Latent Fingerprint
// Latent prints are visualised using magnesium powder, which is gently brushed over these hard and shiny surfaces in order to illuminate them. They are made by the sweat, oil, and other particles in our body.
*Independent variable: Temperature
*Dependent: How well you can see the fingerprint.
*Constants: Same fingerprint used, iron powder, and the types of glasses used.
Our hypothesis was proven true because fingerprints lifted from a lower temperature surface were seen more clearly
This project was done to investigate the effect of surface temperature on the quality of fingerprints obtained. The testing was done by extracting fingerprints from drinking glasses at different temperatures.
-5 drinking glasses.
-Iron powder
-Sheets of paper
1.) Label the 5 drinking glasses (10°, 20°, 30°,40°, 50°)
2.) Fill the glasses with water with different temperatures and make sure they're the adequate temperatures.
3.) Use the gloves, and make sure not to touch the glasses directly and clean to remove any stains or other fingerprints
4.) Once they're clean, take off the gloves and press a finger to the glass surface to create a fingerprint.
5.) Put on the gloves once again and dump the water.
6.) Lift the fingerprints with the iron powder and tape.
7.) Place the lifted fingerprints on a piece of paper.
Background Research
The skin on the surface of our palm and feet has many ridges, called friction ridges. Every person will have a pattern of ridges that is unique only to them and will not change over time. The pattern of on fingers is called the fingerprint. Friction ridges also give us a better grip on smooth, wet, oily or slippery surfaces. Fingerprints that are left on a surface are patent or latent. Patent prints are left by substances like ink, blood, oil or paint, and latent prints are left on surfaces by skin secretions like oil or sweat. .
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