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1. Hg melts at about -38°C
2. Hg boils at aobut 357°C
3. You have to mask the edge of the mirror as it will be turned due to surface tension.
4. You wouldn't want the mirror cell to crack as it would cause an ecological disaster!
5. But then you could always mix it with lead and arsenic (yum yum!) and invent speculum mirrors all over again.
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