AWAITING REAGENT ADDITION SEQUENCE (ETHANOL → PHENOLPHTHALEIN → H₂O₂)
LAB STEP 01 // PRESUMPTIVE CATALYTIC TEST
Kastle-Meyer Phenolphthalein Test
Add reagents in sequential order to the trace swab. In the presence of blood, the iron in hemoglobin catalyzes the oxidation of reduced phenolphthalein by hydrogen peroxide, instantly yielding a bright pink color.