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Hi Kha M,

The copper-catalysed luminol demo is widely performed. I even did it myself at school! (http://www.chm.bris.ac.uk/webprojects2002/fleming/index.htm )

But the idea for the EDTA to mop up the copper ions away from the coin came from a YouTuber as explained in the video above here: https://youtu.be/tnqTONZgsT4?t=222
and in the explanatory text below twice (in the third and penultimate paragraphs each with URLs to the source)

Hope that helps :)

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