What is the chemical that CSI use to find blood, urine, semen...?
603636
Luminol.\n\nLuminol is a chemical that glows greenish-blue when it comes into contact with blood — even traces that are years old. To be exact, it reacts to hemoglobin, an oxygen-carrying protein in red-blood cells. Luminol is so sensitive, it can detect blood at 1 part per million. In other words, if there is one drop of blood within a container of 999,999 drops of water, luminol will glow.\n\n\nInvestigators typically use luminol at crime scenes where no blood is visible. They spray the chemical over a wide area in near-total darkness, so any reaction is obvious. Officers then photograph or videotape the result, using a flash technique that picks up the glow while making the area around it visible and identifiable on film, so the context of the crime scene isn't lost.\n\n\nBut does a glow mean there's blood present? Not necessarily. Luminol reacts to some metals, paints, cleaning products and plant matter. However, the chemical's reaction to each differs in intensity; metals, for example, cause an immediate glow that quickly fades, while blood glows longer. A specialist can tell the difference, and then perform more conclusive tests to determine whether the blood is human.\n\n\nLuminol also can point the way to further evidence or even to how events might have unfolded. For example, if luminol sprayed on a carpet produces a glow, officers might peel back the rug to reveal a floorboard soaked with blood. Or perhaps the glow discloses the direction in which a criminal walked or dragged a body, or whether the victim was shot from behind or above.\n\n\nSo, to anyone thinking that a carpet cleaner or a sponge and soap will erase evidence of their crime, take note. This is one stain that cannot be "shouted out."
90129
Usually by adding copper, transferring the sample into a special reactor which makes it possible to capture resultant gas, and adding acid in order to move the cyanide from a large volume of sample to a small volume of analyte. Depending on your lab, you can determine the cleansed analyte by gravimetry, photometry or titration.\n\nNeedless to say that the process of driving out the cyanide needs to be placed in a suction board and supervized...
526021
Molisch's Test is the reaction of 1-naphthol with carbohydrates in the presence of sulfuric acid.  Carbohydrates are oxidized in this system to furfural derivatives, which will condense with the naphthol to give a purple-colored dye.\n\nFehling's Test is for aldehydes.  Copper (II) sulfate and Rochelle's salt (potassium sodium tartrate) solutions are combined, which causes complexation of the copper with tartrate.  An aldehyde will reduce the copper (II) to copper (I), which will precipitate as Cu2O, a red solid.  Ketones do not react in this manner.
1186961
try using golden seal. get it a few days before you go in for testing.  Then on day of test drink a lot of water, alot, because the more you drink the less concentrated your urine is the harder to pick up on anything.  good luck.
545471
Hi,\nI would suggest writing to your local police authority and asking for help. Tryphoning your local police station (not 999/112/911 - the local number will be in the Telephone Directory) and ask for the nearest forensic science/CSI unit. \n\nTom Walvin
261828
http://www.academic.marist.edu/~jfjp/chem351E3.htm\n\nThe alternate would be ion chromatography
1065220
http://www.itt.edu/staff/boyter/links/index.html#CHEMISTRY_ANALYTICAL
834640
Diagnostic tests: \nIn solution, a cesium will give a flame test color of a beautiful sky-blue. This flame test will be contaminated with the colors of the other alkaline elements which are present in the sample. You will probably need a diffraction spectroscope to view the two blue emission lines from cesium =http://webmineral.com/chem/Chem-Cs.shtml\nhttp://www.chemtopics.com/elements/alkali/alkalif.htm#cesium - to see the exact color go to this site!\n\nSo basically, it's either pale violet or a beautiful sky-blue. Which one for sure, I don't know! - Hope this helps you!
325792
of coarse. DNA is found in every cell. not just semen.
274453
i know semen has fructose in it. I am not sure of vaginal fluid though. It may have some sugar which attract ants.
963309
yes in blood, urine or hair samples....
280765
Look at the links at\n\nhttp://www.itt.edu/staff/boyter/links/index.html#CHEMISTRY_ANALYTICAL
456925
You name it, there is a test for it. They do blood tests, urine tests, they even have a hair follicle test. with that test, they can find out, when you did it, how you did it.
62896
It varies, but mostly sodium chloride and urea dissolved in wayer.  Trace amounts of potassium may be found if blood potassium levels are high enough and often isomers of methylphenol which can cause odor.
525837
Gas chromatography and mass spectrometry are two scientific methods which, when combined, are vital tools in modern forensic chemistry. This technique is used to separate complex mixtures into their purest components. In forensics, it can be used to determine the level of alcohol in a blood sample or to identify different inks on forged or altered documents. Its most important application to toxicology is that it can accurately identify poisons and toxins.
891415
We did a blood test on ourselves back in 9th grade biology class! Guess they don't teach that in school anymore. LOL
341348
Researchers believe that female c*m is produced by the Skene's glands, which are located in a woman's urethra and are made of tissue that's similar in composition to a man's prostate gland. These researchers point to chemical analysis of female ejaculate that reveals the presence of high levels of prostatic acid phosphatase (a chemical secreted by the prostate gland and found in semen). This would seem to indicate that a woman's ejaculation is similar in composition to semen (only without the sperm, of course).