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Used with hydrogen peroxide as a presumptive test for blood. Contains: ethyl alcohol, sodium hydroxide, phenolphthalein and zinc.

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Hazard Alert

Alcohol solution; flammable liquid. Dilute sodium hydroxide is irritating to body tissues.

Product Details

Organic #9
Shelf Life:
Fair to poor.
Pale gray, peach or yellow solution.
Faint alcohol
Technical Note:
Classic test for the presence of blood at a crime scene! Kastle–Meyer reagent contains reduced phenolphthalein indicator in a basic solution. Simply wipe a presumptive bloodstain with a cotton swab, add a drop of the reagent, and then apply a drop of hydrogen peroxide. If the swab turns pink rapidly, it is positive for blood! For a terrific guided-inquiry forensic activity, use the Kastle–Meyer reagent to investigate substances that will interfere with the test to give false positives.