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Engineer's Blue


ans

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You need to get the timing right, but heating the coins up with a blow torch is another method. A bit severe I suppose but a lesson for life can be taught.

Maybe wire one discreetly to the mains or failing that you could try a claymore anti-personnel mine. Perhaps a tad extreme but kids have to learn.

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Single crystal of nitrogen triiodide. Leaves a very purple stain that you can only really remove with sodium thiosulphate.

 

Goes bang too, which is excellent.

Yeah, it's preventing it from going bang in the first place that's the tricky bit. Especially when it's under a dish of disk shaped metal projectiles. (Not least the crockery dish or worse... glass dish it's in.

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