What substances may constitute the matrix of a friction ridge print?

The matrix of a friction ridge print consists of various substances that can help in the deposition and preservation of the print. Sweat, which is composed of water, salts, and organic matter, is a primary component, serving as a natural source that can transfer the ridges of the skin onto a surface. Additionally, grease can be present due to natural oils from the skin, which enhance the visibility and longevity of the print. Paint can also form part of the matrix, especially in contexts where skin contact results in the transfer of paint molecules to the surface being impressed.

The inclusion of these various substances is significant because they come from everyday interactions and environmental exposures, making the latent print more likely to be created in multiple scenarios. Understanding this composition is crucial for forensic analysis, as it guides methods of enhancement and recovery of latent prints that might otherwise be difficult to visualize.