How do I clean antique green glass?

Wash the glass gently in lukewarm water using a mild, unperfumed detergent and a soft cloth. Avoid abrasive sponges, chemical solvents or submerging pieces with metal mounts or enamel decoration for extended periods. Dry the vessel thoroughly with a lint-free cloth to prevent water spots, particularly on pieces with silver overlay or delicate trailed glass threads.

What is the difference between uranium glass and vaseline glass?

Uranium glass contains trace amounts of uranium oxide added to the batch to impart a characteristic yellow-green colour. Vaseline glass is a specific subset of transparent uranium glass that exhibits a distinct greasy or yellow-green hue. Both types react strongly under ultraviolet light by glowing bright green, but vaseline glass is specifically tied to this distinct translucent yellow-green appearance.

How can I tell Loetz iridescent glass from other makers?

Loetz pieces typically display an intense, metallic iridescence with organic, fluid forms and polished pontil marks on the base. Many examples feature distinctive surface decors such as Papillon or Phänomen patterns. Examining the base and interior helps confirm the weight and hand-blown characteristics typical of Bohemian production from this era.

Were silver mounts added later to these glass pieces?

Silver mounts and sterling silver overlay were generally applied during the original manufacturing process as an integrated design feature. Makers partnered with metalwork firms to create fitted collars, handles and hinged lids. Hallmarks on the silver components often provide a reliable date that corresponds with the production period of the glass vessel itself.