Foxed glass refers to the speckled, dark spots and oxidation that develop behind the silvering of antique mirror plates over decades. This natural ageing process creates a characteristic mottled appearance. Many collectors prize original foxed mercury glass for the authentic historic atmosphere it imparts. It distinguishes period mirrors from modern replacements.

Can I place these frames in direct sunlight?

Direct sunlight accelerates the degradation of nineteenth-century gilding and can dry out underlying gesso and wood. Position large frames away from intense windows to preserve the metallic sheen. Stable indoor humidity prevents the wooden substrate from warping and protects delicate carved crests from cracking. Gentle ambient light suits these pieces best.

How do I clean an antique gilt frame?

Dusting should be performed gently with a soft, dry ostrich feather brush to avoid dislodging fragile gesso relief work. Liquid cleaners and chemical solvents must be avoided entirely. Water or commercial polishes strip historic gold leaf and damage the underlying composition. Professional conservators should handle any deep cleaning or structural consolidation.