Under infrared light, where is gunshot residue (GSR) found more easily?

Gunshot residue (GSR) is primarily composed of microscopic particles that can be deposited on various surfaces following the discharge of a firearm. Under infrared light, these residues can often be detected more easily on dark fabric compared to other materials.

Dark fabrics tend to provide a greater contrast against the light-colored GSR particles, making them easier to visualize. The absorption properties of darker materials may also improve the visibility of these residues when illuminated with infrared light, as the dark fabric absorbs some of the wavelengths while contrasting sharply with the lighter-toned residues.

In contrast, lighter fabrics may not provide the same level of contrast against the GSR particles. Glossy surfaces, while potentially reflective and able to show residues, may not be ideal for GSR detection since the particles could easily be obscured by reflections. Metallic surfaces can reflect infrared light in a similar manner, making it more challenging to see the residues as well. Thus, dark fabrics are the optimal choice for effectively detecting gunshot residue under infrared light.