Information can be kept secret using invisible fluorescent ink that can only be seen under UV light.
In this activity, students use a UV light-emitting diode pen to write secret messages and investigate a range of objects to see if or how they fluoresce. By the end of this activity, students ...
Often we hear of ultraviolet radiation (UV) in the media. The message given is that it is a dangerous and invisible component of sunlight that is best avoided – too much UV of any kind can age ...
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