Answer:
purple
Explanation:
the uv rays change the color of the fabric to pick up anything left behind.
UV Light tend to change the white coloured fabrics to be visible as blue coloured.
More about the UV Light:
The wavelength of ultraviolet (UV) radiation ranges from 10 nanometers to 400 nanometers (750 THz), which is shorter than visible light but longer than X-rays. Ultraviolet light is a form of electromagnetic radiation that causes sunburns and the glowing effect on black-light posters. However, excessive UV radiation exposure harms living tissue.
DNA is harmed by short-wave UV radiation, which also sanitises surfaces it comes into touch with. The effects of UV radiation exposure on human skin include a suntan and a sunburn, as well as an increased risk of skin cancer.
Learn more about UV light here:
https://brainly.com/question/23342892
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