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How does surface temperature affect the clarity of a fingerprint?
Transcript of How does surface temperature affect the clarity of a fingerprint?
Cocoa Powder Procedure Put on the gloves and clean the 6 glasses with a washrag to make sure any contamination is off the glass
Fill each glass 80% with water. Each glass should be labeled with a different temperature of 10, 20, 30, 40, 50, and 60 degrees Celsius
Change the temperature of the glass to what the label says by adding ice and heating the water with a soup pot on a stove
Take the gloves off and press your finger onto each glass making a fingerprint Results Put some cocoa powder on the fingerprint and apply cellophane tape over each fingerprint
Take the tape off and put each piece under the correct label on the A4 paper
Rate the clarity of each fingerprint on a 1-6 scale 1 being the least visible and 6 being the most visible
Record the observations in the log book The results were the colder the glass, the greater visibility the fingerprint had. The fingerprints that were taken off the warmer glasses were harder to see and the one for 50 degrees Celsius barely showed up at all. The colder glass fingerprints were very clear and the one for 0 degrees Celsius you could see the ridges and everything! Conclusion My hypothesis was correct, the colder the surface temperature the more visible the fingerprint.