Teichmann, Ludwig Karl
Teichmann, Ludwig Karl
Ludwig Karl Teichmann was a Polish anatomist and physician who made an enduring contribution to forensic science with his discovery of the Teichmann test for hemoglobin . Also called the Teichmann crystal, this is a test that is used on dried stains to determine whether or not blood is present. Dr. Teichmann made his forensic discovery in 1853. His microcrystalline test remains in use today as a means of identifying whether or not dried stains at a crime scene, on clothing or other fabric, or elsewhere at the site of a forensic investigation contain (human) blood.
Teichmann attended medical school in Gottingen, Germany. After completion of his studies, he remained at the university as an anatomy professor. In 1853, Teichmann published a scientific paper in which he described the crystallization of several organic compounds contained in human blood. Within his research paper, he explained a process by which microscopic crystals of hemin could be prepared. Hemin is a substance made up of reddish brown, microscopic, prismatic crystals; it is formed from dried blood by the action of common salt and strong acetic acid (the substance in vinegar that gives it a distinctive odor and pungent taste).
Blood begins to dry after 3–5 minutes of exposure to air, and drips or spatters (blood that is not in large quantities, like pooled blood) typically form crusts quite quickly. Dried blood can readily be confused with other substances, both organic and inorganic, at a crime scene. That is why, when a black, brown, brownish-black, or very dark red substance is found at a crime scene, it is necessary to determine whether or not it is actually blood. The Teichmann test is a presumptive test for blood; it is used strictly to screen for the presence or absence of blood. A positive result from a crystalline test is an indication to go ahead and use other tests to confirm.
see also Blood spatter; Bloodstain evidence; Cast-off blood; Crime scene investigation; Criminalistics.
"Teichmann, Ludwig Karl." World of Forensic Science. . Encyclopedia.com. (November 14, 2018). https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/teichmann-ludwig-karl
"Teichmann, Ludwig Karl." World of Forensic Science. . Retrieved November 14, 2018 from Encyclopedia.com: https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/teichmann-ludwig-karl
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:
Modern Language Association
The Chicago Manual of Style
American Psychological Association
- Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
- In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.