Glass and ceramics

The great European and Asian manufactories produced pieces whose mark, often painted under the glaze, is a valuable identifying element. Each manufactory changed its mark over time; the exact form makes it possible to date the piece to within a few years.

Marks are also copied. Fakes bear the marks of famous manufactories on modern pieces. Only examination of the paste, the glaze, the colours and the decoration can settle the matter.

Ceramics and glass are particularly prone to concealed restorations. A filled chip, a redone base or a replaced handle can be almost invisible to the naked eye. Ultraviolet light and X-rays reveal them easily.

A conservation report is therefore strongly recommended before buying an important piece. Light, well-documented restorations are accepted; heavy restorations lead to a discount of 30 to 70%.

Glass and ceramics attract highly specialised collectors: enthusiasts of one manufactory, one decoration or one period. They share their knowledge in learned societies, publish catalogues and organise specialist fairs.

For a beginner, joining these circles is the best way to learn to recognise authentic pieces, to spot marks and to build contacts with trusted dealers.