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a massive vat of death liquid
If I remember correctly, one of the chemcial plants that @Cycliste used to work at had a last-resort safety system where if one of the reactions got a bit carried away they'd calm things down by dumping a whole load of methanol on top of it to quench the reaction. To that end, they had a large supply of methanol locked, loaded and good to go at a moment's notice. I can't remember how much they had in stored a vessel ready for a methanol quench, should it be required, but I'm fairly sure that the quantity was measured in tons, plural.
If you ran 50 50 no, but it doesn't come that way, so you end up with a massive vat of death liquid somewhere. It's not a terrible idea, just not practical for a daily imo.