What can a chemical test for copper reveal?

A chemical test for copper is specifically designed to identify the presence of copper residues. This kind of test can detect copper ions in a sample, confirming that copper is present, which is particularly useful in forensic investigations.

Copper residues may be found in various contexts, particularly in relation to firearms. For example, if a weapon with a copper jacketed bullet has been fired, residues may be left at the crime scene or on the suspect's hands. Identifying these residues can help forensic investigators establish links between suspects and crime scenes.

While the other options reference other materials or types of evidence, they would not be revealed by a test specifically targeting copper. Lead residues, gunpowder, and ballistic characteristics pertain to different forensic analyses that are beyond the scope of a chemical test for copper.