What are these glass dishes used for?

These pieces function primarily as decorative bowls, chargers, and catchalls for tabletops and sideboards. Historically, versions served as ashtrays, powder boxes, or sweetmeat dishes. Modern owners generally display them empty to showcase the play of light through the opalescent material. Their shallow profiles suit placement on coffee tables or within display cabinets.

How do I identify opalescent glass?

Opalescent glass displays a characteristic milky blue or pearlescent quality when viewed under normal room lighting. When held up to a direct light source, the same glass appears warm amber or orange. This dual colour effect is an optical property of the specific chemical composition used by the maker. It distinguishes these pieces from standard clear or coloured glassware.

What is a coupe ouverte?

A coupe ouverte is a French term translating to open bowl, describing a wide and shallow vessel form. These items provide a broad surface area that displays the moulded design across the interior base. They appear frequently in nineteen twenties and thirties glassware catalogues. The open form allowed makers to feature elaborate floral or animal motifs clearly.