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Depending on what hazmat disposal they have, they'd be better off using something like SYBR Safe, especially with beginners. It's almost as good as EtBr for staining, but not toxic. (Downside: it's much more expensive, EtBr is cheap as hell)

EtBr is cheap as hell, but the hazmat disposal needed to get rid of EtBr gels is very expensive.

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