How do I date a mirror?

Examine the construction methods, backboards, and secondary timbers used in the frame. Hand-cut joinery and original fixings often point to earlier production periods. Inspect the glass plate for signs of age, such as foxing, bevel angles, and distortion within the reflection. Mercury glass indicates greater antiquity, though plates can be replaced over time.

What is mercury glass?

Mercury glass refers to mirror plates silvered using a liquid mercury amalgam before modern chemical silvering processes were invented. This historical technique produces a softer, deeper reflection with characteristic dark spots. Over centuries, the amalgam degrades unevenly, creating the foxed appearance prized by collectors. This ageing process distinguishes antique plates from modern float glass.

Where should I hang an overmantel mirror?

Hang an overmantel mirror securely above a fireplace mantelpiece to anchor the room's proportions. Ensure the wall structure and fixings can support the substantial weight of large giltwood frames. Position the mirror to reflect natural light from windows opposite the fireplace. This placement brightens the interior space and creates a sense of depth.

Are these mirrors fragile?

These pieces require careful handling due to aged timber, delicate gesso mouldings, and heavy glass plates. Changes in room humidity can affect the stability of carved wooden frames and gilt surfaces. Clean the glass gently with dry or lightly dampened cloths without spraying liquids near the frame joints. Protect the giltwood from direct sunlight and heat sources to prevent cracking.