What can bloodstain patterns tell an investigator?
Bloodstain pattern analysis (BPA) is the interpretation of bloodstains at a crime scene in order to recreate the actions that caused the bloodshed. Analysts examine the size, shape, distribution and location of the bloodstains to form opinions about what did or did not happen.
What type of evidence is blood splatter?
Using blood-spatter pattern evidence, it is possible to determine the area of origin of the blood, the direction the blood was traveling, and the angle of impact when the blood struck an object. The type of weapon used to cause an injury is indicated by the size of the blood droplets found in the blood spatter.
What will make luminol glow?
The luminol solution is sprayed where blood might be found. The iron from the hemoglobin in the blood serves as a catalyst for the chemiluminescence reaction that causes luminol to glow, so a blue glow is produced when the solution is sprayed where there is blood.
Can you make luminol at home?
(Ref 1) You can buy luminol, but you can also make it on your own. Mix the luminol powder and washing soda together as a dry mixture in a bowl. Stir in the distilled water a little at a time. Add the hydrogen peroxide to the mixture in the bowl a little at a time.
Does luminol reaction with hydrogen peroxide?
Luminol solution reacts with blood to produce light. The luminol solution contains both luminol (C8H7N3O2) and hydrogen peroxide (H2O2). The hydrogen peroxide reacts with the iron in blood to produce oxygen. This oxygen then reacts with the luminol, changing the structure of the molecule and temporarily adding energy.
What common chemical is used as the base of the luminol reaction?
The luminol is oxidized by the hyrogen peroxide in a basic solution to an excited state.
What in blood increases the reaction rate of luminol and hydrogen peroxide?
If hemoglobin and the luminol mixture come in contact, the iron in the hemoglobin accelerates a reaction between the hydrogen peroxide and the luminol.
Is Luminol a chemical reaction?
The reaction is believed to occur by the following mechanism: The luminol is converted by the basic solution into the resonance-stabilized dianion 1, which is oxidized by the hydrogen peroxide into the dicarboxylate ion 2, accompanied by the loss of molecular nitrogen, N2….
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