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Hi Lumen Miner,
Just a few things on alloy mirrors no longer being used:
*They are not as dimensionally stable as low expansion glass
*Much harder to shape, by ATM's, especially stainless steel
*Would attract dew faster
*Their density is greater than glass (except maybe al), therefore heavier for the same diameter
*When needing to repolish the reflective surface it means regrinding the alloy face, not just a chemical strip & reapplication of al or ag & not touching the shape of the polished glass.
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