Question

What is the specific test used to confirm the presence of human blood in a forensic sample?

• A. Kastle–Meyer Test
• B. Benzidine Test
• C. Takayama Crystal Test
• D. Phenolphthalein Test

Hint:

{Takayama Crystal Test} is a confirmatory test for blood in forensic science. It forms distinctive {pink hemochromogen crystals}, confirming the presence of blood in the sample.

Answer 1

The Correct Option is C

Concept: In forensic science, blood identification is usually carried out in two stages:

• Presumptive tests – These tests indicate the possible presence of blood.
• Confirmatory tests – These tests confirm that the stain is actually blood.

Presumptive tests are quick screening methods, while confirmatory tests provide reliable proof of blood in a forensic sample.
Step 1: Understanding presumptive blood tests.
Examples of presumptive tests include:

• Kastle–Meyer Test
• Benzidine Test
• Phenolphthalein Test

These tests react with the enzyme-like activity of hemoglobin and give a color change, suggesting the possible presence of blood.
Step 2: Identifying the confirmatory test for blood.
A confirmatory test is required to prove the presence of blood. One such test is the Takayama Crystal Test, which produces characteristic pink hemochromogen crystals when blood is present. This microscopic crystal formation confirms the presence of blood in the forensic sample. Thus, the correct answer is: \[ \boxed{\text{Takayama Crystal Test}} \]