What causes foxed glass?

Foxing occurs when moisture or air breaches the protective backing of the mirror plate over decades or centuries. This chemical interaction alters the metallic layer behind the glass. The resulting dark spots and cloudiness create a unique speckled pattern that cannot be replicated artificially.

How do I hang a heavy overmantel mirror?

Heavy overmantel mirrors require secure fixings anchored directly into structural wall studs or masonry. Professional installation is strongly recommended given the substantial weight of old timber and glass. Due to their size, these frames distribute weight across specific load points that must be properly supported.

Are mercury glass mirrors original?

Many eighteenth and nineteenth century mirrors retain their original mercury glass plates, which display distinctive mottled ageing. Replacement plates occasionally appear where historical damage occurred. Examining the depth and nature of the foxing helps determine whether the reflective plate matches the age of the frame.

How do I clean an antique gilt mirror?

Dusting gently with a dry, soft brush protects fragile gold leaf and composition ornament from damage. Moisture and modern cleaning chemicals can strip historic gilding. Glass surfaces require careful wiping with a barely damp cloth while avoiding contact with the wooden frame.