High visibility clothes (also known as Reflective-wear) have become very essential for the protection of people working in poorly lit environments like mines, highways, airport runways, cyclist, etc. In the dark, the high visibility clothing increases the ability to spot working and guiding personnel
There are broadly three types of high visibility clothing:
Photoluminescent materials absorb the artificial light and emit green-yellow light in the darkness. Zinc Sulphide crystals which are not radioactive and nontoxic pigments. Fluorescent materials convert energy from non-visible UV rays into visible. These are useful during daylight but offer little protection in the dark as they do not emit or reflect light.
Ideal high visibility apparel should have the following characteristics
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