Hey now, that dihydrogen monoxide is dangerous stuff. Extended contact with the solid form can cause severe injury, and the gaseous form in significant quantities doesn't even need extended contact, it does its damage almost immediately.
Even the relatively safe and stable liquid form can be deadly if drank in significant quantity or inhaled in even small quantities, and a person submerged in it for even a few minutes without special equipment is in a bad spot.
Other people are giving good advice, but you should also know that it isn't that dangerous. People have died from the fumes, but only when they have a lot of dry ice in an enclosed area (e.g. a car). It can cause explosions, but that's mostly from people going out of their way to build bombs. It can cause burns, but not instantly and the pain will warn you before you get seriously injured.
Don't be particularly afraid. It's not hard to handle.
It only destroys the goods if you let them soak in the solution for hours. How does that make it dangerous? If someone wanted to just destroy goods, fire is way more effective.
It's way more dangerous than non-flammable inert gas. Why would you even try to whitewash it like that? It's just silly.
The amount of gas produced in a high school chemistry lab compared to a full tank is just silly. To compare a high school lab environment with safety equipment and assuming a trained teacher to a couple of knuckleheads with no safety training or equipment doing a balloon launch in a very drought striken part of the state is so not even close to the same.
But thanks for trying to make it seem so much less dangerous than what it is
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