today i learned one shocking thing: i cannot ID my prints for my life.
like seriously, every time i try, my prints either turn fat and thick and gross or thin and thicker and just as gross. what's worse is that my worksheet is stained all over by melvina yeo's fingerprints!!!
well hehe i would rather my worksheet be stained than my face and fingers. BUT THAT HAPPENED ANYWAY (...haha) and it was tiresome to wash it all off.
now, on to more serious stuff.
in the beginning there was this mini mystery concerning a raccoon and rubbish and a dog and stuff. everybody knew the answer and was screaming it out while i just sat there not knowing anything. i hope that this is not a dependable indicator of my csi marks.
we also started on the topic of fingerprints. i learned about fingerprints in primary two but i forgot all about it. heehee. anyways, out of the loop, whorl and arch fingerprint types, i have 5 loops, 2 whorls and 3 arches.
...how did you know that if you couldn't ID your prints properly? you ask. errr well i had to squint at my fingers really really hard and look like an idiot.
to see which type of fingerprint one has, you have to look at the number of deltas, which are triangular-like thingies on your finger. since my eyesight isn't that great i probably identified a few of my prints wrongly. oops?
methods
so. we learned more about fingerprints today! surprise surprise!
but first off there are three types of fingerprints:
visible prints are just that. you know those ugly smudges on handphone screens or glass windows? yeah.
impressed prints are not amazed by your good looks or your amazing GPA, rather, they are imprinted in stuff like clay and paint.
latent prints are not visible... unless you make them visible! okay, lame. they need chemical reactions to be developed.
we used the superglue fuming method, the iodine fuming method and the powder dusting method. contrary to popular belief, they really aren't as fun as they sound.
the fingerprints on the paper strip which we fumed with superglue vapors didn't really show up well on mine, probably because it was placed on top of a bunch of other paper strips. "The actual amount of time required for such a reaction to take place depends on several factors: concentration of cyanoacrylate fumes, humidity levels and size of fume box etc."... ): oh well.
the iodine fuming method was pretty funny because a) the glass thingy covering the tube in which the paper was being fumed kept on falling off and breaking and b) we were all confused as to why our fingerprints kept fading. in reality the print is supposed to fade because it's a physical and not a chemical reaction. the "natural body fats and oils" in our latent print "absorb the iodine vapors" which eventually dissipates in the atmosphere. sounds kinda erk, doesn't it?
powder dusting was the best, simply because i was the only one on my bench who could do it like a boss.
to see which type of fingerprint one has, you have to look at the number of deltas, which are triangular-like thingies on your finger. since my eyesight isn't that great i probably identified a few of my prints wrongly. oops?
methods
so. we learned more about fingerprints today! surprise surprise!
but first off there are three types of fingerprints:
visible prints are just that. you know those ugly smudges on handphone screens or glass windows? yeah.
impressed prints are not amazed by your good looks or your amazing GPA, rather, they are imprinted in stuff like clay and paint.
latent prints are not visible... unless you make them visible! okay, lame. they need chemical reactions to be developed.
we used the superglue fuming method, the iodine fuming method and the powder dusting method. contrary to popular belief, they really aren't as fun as they sound.
the fingerprints on the paper strip which we fumed with superglue vapors didn't really show up well on mine, probably because it was placed on top of a bunch of other paper strips. "The actual amount of time required for such a reaction to take place depends on several factors: concentration of cyanoacrylate fumes, humidity levels and size of fume box etc."... ): oh well.
the iodine fuming method was pretty funny because a) the glass thingy covering the tube in which the paper was being fumed kept on falling off and breaking and b) we were all confused as to why our fingerprints kept fading. in reality the print is supposed to fade because it's a physical and not a chemical reaction. the "natural body fats and oils" in our latent print "absorb the iodine vapors" which eventually dissipates in the atmosphere. sounds kinda erk, doesn't it?
powder dusting was the best, simply because i was the only one on my bench who could do it like a boss.
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