Explanation:The Kastle-Meyer test depends on the iron on hemoglobin which is iron found in the red blood cell, which encourages the oxidation process of phenolphthalin to phenolphthalein.
phenolphthalin has no color however when it get into contact with blood and hydrogen peroxide , it convert into phenolphthalein, which brings out the pink results.
Police detective uses this test on their crime scenes.
