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@Momentum
Or I could try and collect the hydrogen to run my ipod!
Definietly need good ventilation - an interesting point that I read is that the ventilation needs to be at the top of the space, otherwise the hydrogen will gather at the highest point in a pocket until a spark comes along...
It's also a pretty exothermic reaction once the oxide comes off and the sodium hydroxide is pretty unfriendly to skin, eyes, etc. Will try it on the street outside my flat with some rubber gloves I think.
Will report back once I have done this (and will hopefully be able to show you a pair of these babies on my bike):