Blood is often a critical form of forensic evidence. Its analysis can aid in reconstructing events at a crime scene, identifying individuals, and potentially linking suspects to criminal activity. On light-coloured surfaces, blood is typically easy to detect due to the strong contrast it creates against the background. However, detecting blood on darker substrates presents a greater challenge, as both the blood and the surface absorb significant amounts of visible white light—resulting in minimal contrast when using standard white illumination.