![]() This also happens in sunlight, but the large amount of visible light the sun sends out makes it harder for us to see the fluorescence! Chemicals in the highlighter ink absorb the UV light and spit it back out as lower energy, visible yellow light. In this setup, the black light provides high energy ultraviolet (UV) light, which is invisible to our eyes. To better illustrate fluorescence in action, let’s look at our highlighter drawing under black light. So what causes this awesome display of extra brightness? Well, the answer is a phenomenon called fluorescence, and it is the key to the secret world around us.įluorescence happens when something absorbs light of a certain energy and then emits light with (typically) less energy. Do you notice that the box you’ve drawn seems to get even brighter? It almost seems like it is glowing, appearing more yellow than before. Since we could all use a bit of exercise, take your highlighter drawing and venture out into the sunshine. Below is my highlighter box along with one drawn using a sharpie for comparison. In My Secret World.ĭo you have a yellow highlighter by you? Hurry! Grab it and follow along! Using the highlighter, draw a box on a sheet of paper. ![]() Prepare to embark on a colorful and illuminating journey.ĭid you know that there is a secret world that exists right in front of your eyes? Did you know that we scientists have tapped into this secret world and are exploiting it to push the boundaries of knowledge? Me.
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