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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.

User Etxalpo
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2 Answers

13 votes
13 votes

Answer:

a. luminol b. phenolphthalein

Step-by-step explanation:

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

User Ozkank
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17 votes
17 votes

Answer:

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.

User Yukino
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3.2k points