We use thermos flasks a great deal at work - we could spend £250 on a single, fragile glass vacuum dewar or we could buy ten moderately priced camping thermos flasks - the extra efficiency in liquid nitrogen is not worth the outlay. But I digress. The latest batch are platic-coated metal, and the top/cap/mug bits are also in use in the lab
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It's probably ruining your fume hood as well.
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