Luminol and bleach solution reaction.
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Previously:
https://www.homemadetools.net/forum/...635#post209417
https://www.homemadetools.net/forum/...283#post208139
https://www.homemadetools.net/forum/...678#post205994
https://www.homemadetools.net/forum/...798#post156106
https://www.homemadetools.net/forum/...250#post150146
