To make a mirror, the sheet glass needs to be in your inventory, not in the bench. The temperature of the bench must be higher than 5000, or the silver powder will blow away and be lost. There doesn't seem to be any upper limit to the heat, as it works even with 5000+ temperature.
- 6 used in a Mutagenics Lab.
- 3 used to upgrade an Acoustics Laboratory with a reflectory.
- 4 used in a Funerary Temple.
- Various amounts used in a Metallic Obelisk.
- 1 used in a Trophy Case for Test of the Archaeologist.
- 7 used in a Prismatic Opticon.
Research and Tuition
- 10 needed for Crystal Acoustics research.
- 16 needed for Obelisk Construction 2 research.
- 50 needed for Mutagenics research.
Acoustics Laboratory, Crystal Acoustics, Funerary Temple, Metallic Obelisk, Mutagenics, Mutagenics Lab, Obelisk Construction 2, Prismatic Opticon, Throne of Pharaoh/Throne Decoration Materials, Trophy Case