Or tarnishes, either of the above would happen otherwise.
Silver mirrors are the most reflective, but they tarnish, making them obsolete in due time.
English
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*nods and sighs*
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*Gets up* "If you ever want to try out some Dark Metal swords, I have a large amount of raw Dark Metal. Its qualities are quite unique." *Walks out through corner shadow*
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Dark metal... I wonder how that would react to the heat...