Quote:
Originally Posted by bobson
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Seen some parts made this way at work for an industrial application... the finished product is far too porous. It resembles sintered metal parts... it will take fine-grinding, then when polished the surface resembles polished basalt - it has what I would call a very high sheen that is visibly fine-grained - not exactly a high polish.
...basically you can forget making high quality mirrors from it.
A few years ago mirrors were being made of a type lightweight, black glass that was sintered from a fine powder, it was soft and ground and polished easily and polished well ... Satchmo will know what this was.