How should I clean an antique mirror glass?

Clean antique glass gently using a soft microfiber cloth and a minimal amount of distilled water or mild, non-ammonia glass cleaner. Spray the liquid onto the cloth rather than directly onto the glass to prevent moisture seeping behind the plate. Avoid commercial chemical cleaners, as they can damage degraded silvering or seep into the wooden joints and gesso surrounds. Take care around the edges where the silver backing is often fragile and prone to oxidation.

How do I identify the period of a cushion mirror?

Dating relies on examining the construction methods of the wooden substrate, the composition of the gesso, and the characteristics of the glass plate. Seventeenth-century examples often feature walnut or oyster veneers, while nineteenth-century pieces frequently display heavier giltwood carvings or pressed brass. Inspect the reverse of the frame for original backboards, old fixings, and tool marks that reveal the manufacturing era. Hand-beveled edges and mercury silvering also provide reliable chronological clues for older plates.

Where is the best place to hang an overmantel cushion mirror?

An overmantel cushion mirror is traditionally positioned directly above a fireplace mantelpiece to anchor the room's focal point. The expansive surface reflects light from windows across the space, making the room feel brighter and more voluminous. Ensure the mantelpiece can support the scale of the frame and that the mirror is hung securely at a balanced height above the hearth. They also function effectively above large sideboards or in spacious reception halls.