How do I clean vintage pressed glass?

Wash pieces gently in warm, soapy water using a soft cloth to protect the surface. Avoid harsh abrasives that can damage frosted or stained finishes. Dry immediately with a lint-free towel to prevent water spots on clear or opalescent surfaces.

Why does opalescent glass change colour?

Opalescent glass contains specific chemical agents that react to ambient light conditions. It appears milky white in transmitted light and shifts to blue in reflected light. This optical play was a deliberate innovation by interwar glassmakers to create depth.

Can these ceiling lights be rewired?

Most antique glass shades and plafonniers can accommodate modern electrical wiring safely. A qualified electrician should check the fitting to ensure it meets current safety standards. Retaining original metal mounts where possible preserves the historical integrity of the fixture.

How do I distinguish 1920s glass from later reproductions?

Examine the weight, mould seams, and the sharpness of the relief detail. Period pieces display characteristic wear beneath the base and genuine chemical coloration rather than superficial paints. Consulting known archive catalogues helps confirm authentic forms and signatures.