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Osmium tetroxide
For those who are interested, the melting point is 40 C and the boiling point is 130 C, which means that it is pretty volatile. How stable it would be in an explosion, I don't know. It is extremely poisonous; my faithful copy of the Rubber Handbook says that concentrations as low as one tenth of a millionth of a gram per cubic metre of air can cause lung congestion, skin damage or eye damage. On the other hand, I don't have a price list to hand, but I would guess that you're entering arm and a leg territory. All in all, a most peculiar choice.
Here endeth the lesson.
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