In this activity we lifted fingerprints from a glass surface and a black countertop. We did this by taking a finger and rubbing it on the bridge of our nose and our forehead in order to get an adequate amount of oil on our finger. We then pressed our finger on the surface and carefully lift it in order to not smudge the print. Depending on whether it was on the glass surface or on the black countertop we used a black or white powder in order to distinguish the prints. On the glass surface we used a black powder made out of graphite and then used a white powder for the black countertop. We used the powder and lightly dusted the fingerprint and brushed away gently at the excess powder. We then took clear tape and placed it on the print making sure we got a negative of the print.
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| Fingerprints (sorry if they are a bit blurry) |
I had SOO much trouble with this lab! It was really hard to dust the fingerprints with the powder, and it was a miracle once I finally got it to work for me. You got it done in like 10 seconds flat! :) It was really fun, though. You were very precise in how you can attach a fingerprint to the tape and actually see it, keep up the good work!
ReplyDeleteChristine add more mechanics in your writing such as highlighting different words so it could enhance your posting.
ReplyDeleteexcellent description of the activity! I could imagine the entire activity taking place.
ReplyDeleteyour details were concise yet elaborate.
if possible, add pictures. but you might not have access to pictures, so thats understandable
nice work:)
i dont think you need to highlight your work, its well written, only lacking in pictures though :/
ReplyDelete