This word is used to describe optical brighteners. They can also be called fluorescent dyes. They would primarily be seen in their role in producing papers that are extremely bright. They accomplish this by taking in the ultraviolet lights (which are invisible) before transforming it to lights that are visible. These lights would normally be positioned in the area where the blue and violet lights are dominant in the spectrum. From that point on, we would then be able to see it clearly as the reflections hit our eye.
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