Christian Friedrich Zincke is widely credited with bringing the technique of enamelling portrait miniatures to Britain during Queen Anne's reign. It is an incredibly skilful process whereby each colour, made of powdered glass, is fired separately at different temperatures. The resultant portraits are extraordinarily durable; the colours in our portrait of this unknown - almost certainly aristocratic - child are as vivid today as they were 300 years ago when they were first created. Zincke's work is widely admired and examples can be found in the National Portrait Gallery, the Gilbert collection at Somerset House and the Metropolitan Museum of Art.