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the-gist.org/2011/03/seeing-red-–-presumptive-tests-for-blood

Presumptive blood tests cannot determine the origin of the blood, it can only determine if the stain is most likely blood or not blood. If you get a positive result from a presumptive test and the stain appears to have the appearance of blood (i.e. red/brown) then there is another test called the ABA Hematrace test that can easily and rapidly determine whether or not the presumptive blood is ...

www.encyclopedia.com/.../blood-presumptive-test

Blood, Presumptive Test A forensic investigator can be confronted with a variety of fluids at a crime or accident scene. It is critical to determine the nature of each fluid. While a detailed examination of a suspect bloodstain requires the equipment and technical expertise of an analysis laboratory, a fluid suspected of being blood can be examined at the scene to determine if it indeed could ...

en.wikipedia.org/wiki/Presumptive_and_confirmatory_tests

Presumptive tests, in medical and forensic science, analyze a sample and establish one of the following: . The sample is definitely not a certain substance. The sample probably is the substance. For example, the Kastle–Meyer test will show either that a sample is not blood or that the sample is probably blood but may be a less common substance. Further chemical tests are needed to prove that ...

sites.law.duke.edu/forensicsforum/2017/03/17/an-overview-of-presumptive-and...

The Amanda Knox/Raffaele Sollecito case introduced some observers to the uses and misuses of presumptive and confirmatory blood tests. The use of two stages of testing is encountered in at least two forensic disciplines: testing for body fluids (blood, saliva, and semen), and testing for illicit drugs.

www.sirchie.com/blood-id-leuco-malachite-reagent-kit.html

This Blood Identification Kit utilizes Leuco-Malachite (McPhail’s Reagent) to provide a field test for the presumptive identification of blood. Each test consists of two chemical reagent ampoules contained in a rugged disposable pouch. A blue/gre

flash.lakeheadu.ca/~lubiotec/Presumptive Test for Blood.pdf

The Kastle-Meyer test is a forensic presumptive blood test, where the chemical indicator phenolphthalein is usedPhenolphthalein, a clear dye, immediately turns pink if oxidized by hemoglobin and hydrogen peroxide The test is based on the peroxide-mediated oxidation of reduced phenolphthalein in which the heme molecule acts as a catalyst.

www.homesciencetools.com/product/aldon-presumptive-blood-test-kit

With its immediate results, this test is a favorite among crime scene investigations (CSI). While not hard proof, presumptive blood test results can help detectives uncover other evidence. This kit is great for teaching students about forensic science (crime scene science). This Presumptive Blood Test Kit, from Innovating Science, contains:

dps.mn.gov/.../forensic-science/Pages/forensic-programs-crime-scene-luminol.aspx

The reaction is not specific to blood, however, as other oxidizing agents such as sodium hypoclorite (bleach), certain metals, and plant peroxidases may also cause luminescence with luminol. Because the reaction is not specific to blood, a follow up presumptive test, such as phenolphthalein , is typically run on potential samples prior to ...

www.sog.unc.edu/sites/www.sog.unc.edu/files/course_materials/Presumptive and...

Presumptive and Confirmatory Forensic Tests Definitions: Presumptive tests - can establish the possibility that a substance, bodily tissue or fluid is present Confirmatory tests - are used to conclusively identify a substance or specific biological material References: President’s DNA Initiative (for serology tests)