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Kay [80]
2 years ago
7

When is it more appropriate to use presumptive tests in a crime investigation? When is it more appropriate to use confirmatory t

ests in a crime investigation? Why is hemoglobin important for presumptive tests for the presence of blood?Describe how the Kastle-Meyer test is used to detect blood at a crime scene.
Biology
1 answer:
k0ka [10]2 years ago
7 0

Answer:Phenolphthalein is a presumptive test that reacts with the heme molecule present in blood. A positive reaction gives a pink color. While bloodstains normally appear red-brown in color, the color of the substrate or the age of a stain may affect the appearance or visibility of the stain.

Explanation:

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