Kastle-Meyer Test Procedures and Results

The video tutorial explains the Kastle-Meyer test, a presumptive test for detecting blood. It outlines the three-step procedure: collecting a small sample using a cotton swab or filter paper, adding ethanol, Kastle-Meyer reagent, and hydrogen peroxide. A positive result is indicated by an immediate pink color, while a negative result shows no immediate change but may turn pink after a few minutes.

What is the primary purpose of the Kastle-Meyer test?

• To measure the amount of blood

• To confirm the presence of blood

• To determine the blood type

• To identify the DNA in the blood

What is the first step in the Kastle-Meyer test?

• Taking a sample of the blood stain

• Adding Kastle-Meyer reagent

• Adding hydrogen peroxide

• Adding ethanol

What is added to the sample after ethanol in the Kastle-Meyer test?

• Salt solution

• Kastle-Meyer reagent

• Hydrogen peroxide

• Water

What is the final chemical added in the Kastle-Meyer test?

• Distilled water

• 3% hydrogen peroxide

• Ethanol

• Kastle-Meyer reagent

What indicates a positive result in the Kastle-Meyer test?

• A blue color change

• No color change

• A yellow color change

• A pink color change