How do I identify rib moulding?

Rib moulding appears as raised parallel lines running vertically or diagonally along the exterior surface of the glass vessel. These tactile ridges were formed when the molten gather was pressed into a patterned dip-mould before being inflated. On authentic pieces, the interior often retains a corresponding smooth counter-impression while the outside shows clear relief. This technique provides both a secure grip and decorative texture to eighteenth-century drinking glasses and jugs.

What is a bonnet glass?

A bonnet glass is a small, flared vessel featuring moulded decoration, utilised historically for serving individual portions of sweetmeats or custards. Their distinctive shapes often incorporate ribbing, fluting, or hexagonal panels. Collectors prize these small forms for their survival rate and the variety of pressed patterns applied to their bodies. They sit comfortably among table displays alongside contemporary dram and wine glasses.

Are these glasses made of lead glass?

Many eighteenth-century tablewares incorporate lead oxide into the batch, producing a heavy, resonant metal with high refractive qualities. This heavier composition allowed makers to achieve sharp definition when pressing glass into intricate moulds. Lead glass responds well to light and develops a soft polish over centuries of handling. Testing involves observing the ring of the metal and checking for the characteristic density associated with the period.

How should I clean antique glass?

Cleaning requires warm water and mild detergent applied gently by hand, avoiding harsh abrasives or submerged soaking in hot water. Sudden temperature changes can stress old metal and damage delicate applied elements like folded feet. Dry the surface immediately with a soft lint-free cloth to preserve the natural lustre of the lead glass. Proper maintenance protects the delicate moulded relief from unnecessary wear over time.