Page 206 - Demo

Practical Applications of Chemistry
Forensics Blood Evidence, continued
Presumptive Blood Test—
Forensic Demonstration Kit
By: The Flinn Staff
This kit utilizes a simulation of the Kastle-Meyer Color Test and can be safely used in a mock crime scene investigation. The Kastle-Meyer Color Test is often used by crime scene investigators to presumptively indicate if blood is present on an object. For this activity, objects in your crime scene can be “seeded” to provide positive color tests for “simulated blood” when sprayed with the phenophthalein test solution. The test is fast and easy and is thus ideal for use in the first moments at a crime scene. Crime scene investigators like this test even if the results are only “presumptive” and not considered hard proof. The presump- tive tests can often lead investigators in the right direction to search for additional proof. The kit contains enough materials to conduct many simulated Kastle-Meyer Color Tests on crime scene items. Comes complete with teacher background and directions.
Concepts: Presumptive test, oxidation.
Time Required: 15 minutes
Materials Provided: Phenolphthalein solution, spray bottle, cotton cloth, filter paper, simulated blood plasma.
Forensic Glow—Blood System
Demonstration Kit
By: The Flinn Staff
You arrive at the crime scene, a murder has occurred. Bloodstains should be present but can’t be seen. How can you determine if and where the blood is located? In this activity, a simulated blood sample will be detected using a chemiluminescent blood detection solution similar to the type used by actual forensic scientists! As the blood detection solution comes in contact with simulated blood, a bright blue glow appears. An excellent inexpensive activity that may be used alone or added to your current forensics unit. Includes detailed instructions and enough materials to perform the activity over 50 times. No blood or blood products are used.
Concepts: Forensics, chemiluminescence, bloodstain patterns.
Time Required: 15 minutes
Materials Provided: Luminescent blood detection solution, hydrogen peroxide, simulated blood sample.
Who Cheated in the Race? Red Blood
Cell Volume Forensic Laboratory Kit
By: Diane Sweeney
Punahou School, Honolulu, HI
The bicycle race is over and the top three finishers have been accused of cheating by blood-doping, a means of artificially increasing the number of red blood cells in the body. Students become real-world lab technicians as they analyze red blood cell volumes in simulated blood samples. Students conduct a hematocrit of several simulated blood samples and compare their data with other groups’ test results. Critical- thinking and cooperative-learning skills are developed as together students analyze data and draw a conclusion—did any of the cyclists cheat? Includes complete instructions with reproducible student hand- outs, detailed background information, and valuable Instructor Notes.
Complete for 15 groups of students. Activity is a chemical simulation and contains no actual blood or blood products.
See free video at flinnsci.com.
1-800-452-1261
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Presumptive Blood Test—Forensic Demonstration Kit FB1646
Catalog No.
Description
Price/Each
FB1646
Presumptive Blood Test—Forensic Demonstration Kit
$22.80
Forensic Glow—Blood System Demonstration Kit AP6292
Catalog No.
Description
Price/Each
AP6292
Forensic Glow—Blood System Demonstration Kit
$21.85
Catalog No.
Description
Price/Each
FB1998
Who Cheated in the Race? Red Blood Cell Volume Forensic Laboratory Kit
$30.55
FORENSICS BLOOD EVIDENCE continued on next page.
Who Cheated in the Race? Red Blood Cell Volume Forensic Laboratory Kit FB1998