Visualization of gunpowder residue on blood stained clothes can be facilitated by?
A. Ultraviolet rays
B. Infrared rays
C. Magnifying lens
D. Paraffin test
Correct answer : B. Infrared rays
Usually, gunpowder residue can be easily seen on clothes.
But in blood stained / dark coloured clothes, it may not be visible to the naked eye or when using a magnifying glass.
In these cases infrared photography helps in visualizing gunpowder residue / soot.