Can I use these vessels for serving wine?

Many decanters and rummers remain fully functional for serving drinks, provided the interior shows no chemical staining or cloudiness from past use. Assess the condition of the inner surfaces before introducing liquids. Delicate eighteenth-century wine glasses with air or opaque twists serve better for display or gentle toast use rather than daily dining routines.

What is the difference between lead glass and crystal?

Lead glass and crystal refer to similar high-clarity materials, though regulatory standards define crystal by specific lead oxide content and density. Both types were developed to improve brilliance and allow deeper cutting. Historic British and continental makers used these terms interchangeably to describe vessels with superior weight and light-reflecting properties.

How do I date an old glass decanter?

Examine the base for pontil marks, where the pontil rod was snapped off during hand-blowing, which typically indicates production before the widespread adoption of machine grinding. Blow-moulded seams and stopper shapes also provide clues to the manufacturing period. Compare the cutting style against documented periods like the Georgian era or the Edwardian period to narrow down the decade of manufacture.