Question

Petra finds a discolored stain on the carpet at a suspected crime scene. What two presumptive tests might she use to determine if the stain is blood? First, Petra sprays the discolored area with , which returns a glowing blue color. However, she knows that this chemical might also turn blue with other substances that contain iron. Subsequently, she uses , which turns pink, indicating the presence of hemoglobin.

Answer 1

a. luminol b. phenolphthalein

Step-by-step explanation:

looked it up, luminol turns green and the other one turns pink

Answer 2

First, Petra sprays the discolored area with

Fluorescein

, which returns a glowing blue color. However, she knows that this chemical might also turn blue with other substances that contain iron. Subsequently, she uses

Phenolphthalein

, which turns pink, indicating the presence of hemoglobin.