The best replacement for luminol is luminal.

The best alternatives to luminol are rated as following:
★★★★★  luminal
★★★★★  bluestar

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Speaking about luminol, one probably shouldn't forget about chemiluminescence.

Other search terms related to luminol and their ratings are:
★★★★★ chemiluminescence
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Google Trends

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luminol
luminal
bluestar