Crime Busters B

ledwards003
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Re: Crime Busters B

Postby ledwards003 » January 9th, 2019, 4:55 pm

Incineroar999 wrote:Hello. I'm a newbie and I have NO IDEA what I'm doing. Please give me any tips!!!


Study powders, metals, and liquids like crazy!! They are so so important. Make sure you know the difference between different kinds of fingerprints and ONLY PUT WHAT YOU NEED ON YOUR CHEAT SHEET. Also make sure you leave time for your analysis (I suggest using bullet points), which should be written by whoever is done first. Underline useful information (what animals the suspect has, what kind of clothes they wear, etc.) and learn at least a bit about the history of forensics (like the father of fingerprinting, wha CODIS stands for, what IAFIS stands for, etc.). Learn about DNA and its 4 nitrogenous bases, know what DNA stands for, and basically just know about DNA. Just.... make sure you know the 4 nitrogenous bases and the biggest differences between unknowns like the back of your hand and edit your cheat sheet as you go. And please please always remember the analysis, it is so many points and is important okay.

I hope this was able to help!! I know it was a lot, but there is a lot to know!!!

ledwards003
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Re: Crime Busters B

Postby ledwards003 » January 9th, 2019, 4:59 pm

scipanther55 wrote:Hey Guys,

Wondering if we are allowed to conduct a scratch test for metals?

Also,
Does anyone know what liquids they will provide when testing the density of plastics?

Thanks


I have never conducted a scratch test, I look at the color, see if it is magnetic, and see how it reacts with HCl.

I actually looked up what liquids they will likely be using!! Corn oil, 70% isopropyl alcohol, 10% NaCal solution, 25% NaCl solution, saturated NaCl, and water. This may not be completely correct, but it is what I had written down and I am pretty sure it is what will be used.

Crimesolver
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Re: Crime Busters B

Postby Crimesolver » January 9th, 2019, 6:35 pm

Last year at states I tried using it for a sample that I was 99.999% sure was flour, but it wouldn't react. Also, I accidentally got it on a wool(?) sample and it turned brown. Can someone explain this?
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Re: Crime Busters B

Postby amk578 » Yesterday, 7:17 am

At this one competition, they gave vinegar as an additional reagent to HCl and iodine, what is the purpose of vinegar in IDing unknowns?
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jimmy-bond
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Re: Crime Busters B

Postby jimmy-bond » Yesterday, 8:04 am

amk578 wrote:At this one competition, they gave vinegar as an additional reagent to HCl and iodine, what is the purpose of vinegar in IDing unknowns?

The only thing I can think of is with baking soda
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Re: Crime Busters B

Postby CPScienceDude » Yesterday, 12:42 pm

jimmy-bond wrote:
amk578 wrote:At this one competition, they gave vinegar as an additional reagent to HCl and iodine, what is the purpose of vinegar in IDing unknowns?

The only thing I can think of is with baking soda

Yeah, I'm not sure either except for the baking soda.
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