What causes dark spots on antique mirror glass?

The speckled marks, known as foxing, occur when moisture slowly degrades the silver backing applied to the rear of the glass. This chemical reaction develops naturally over decades of exposure to ambient humidity. Many collectors value this ageing process as proof of genuine age rather than a defect. It distinguishes traditional silvering from modern reflective coatings.

How should I clean an antique oak frame?

Dust the carved timber regularly with a soft, dry cloth to prevent particulate build-up in the recesses of the grain. Avoid modern silicone polishes that can leave a sticky residue and attract dust. Apply a traditional beeswax sparingly if the timber appears dry, buffing it gently after application. Keep moisture away from both the wood and the vulnerable edges of the mirror glass.

Are these mirrors suitable for bathrooms?

High humidity and fluctuating temperatures can damage antique oak timber and accelerate the decay of the mirror silvering. Bathrooms generally lack the stable environment required to preserve nineteenth-century adhesives and backing boards. Positioning them in dry reception rooms, hallways, or bedrooms ensures the wood and glass remain stable. Adequate ventilation is essential if placed near areas prone to moisture.