Alcohol solution; flammable liquid. Dilute sodium hydroxide is irritating to body tissues.
This item can only be shipped to schools, museums and science centers
Fair to poor.
Pale gray, peach or yellow solution.
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.