This is really cool.  Ever wonder what the bright and incredible ink from a highlighter is called?  The name is  fluorescein and this guy makes a very neat video showing you how to collect it from markers!   In addition to markers, it can be used for water tracing and the detection of leaks as well as in forensics.  Highlighter markers use fluorescein as well a binder to prevent the ink from leaking on the page.

Check out the next page for the instructional video and steps!

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