Leucomalachite green is used as a chemical test for which of the following?

Leucomalachite green is utilized as a chemical test specifically for detecting blood. This reagent works by producing a colorimetric reaction in the presence of hemoglobin, which is a key component of blood. When leucomalachite green is applied to a suspected blood sample, it undergoes an oxidation reaction that results in a color change, typically to a green hue. This characteristic reaction is what makes it a reliable indicator for the presence of blood at crime scenes or in forensic investigations.

In forensic settings, this test is particularly useful because it can detect blood even after it has dried, allowing investigators to identify potential traces at various locations. The sensitivity and specificity of this test enable latent print examiners and other forensic professionals to ascertain the presence of blood, which can be crucial for further analysis and building evidence.

Other options, while essential in the realm of forensic science, do not pertain to leucomalachite green's chemical properties or its applications in testing.