A RARE CHINESE REVERSE GLASS PAINTING LATE 18TH CENTURY Depicting Madame de Pompadour in an interior

A RARE CHINESE REVERSE GLASS PAINTING LATE 18TH CENTURY Depicting Madame de Pompadour in an interior, wearing an Oriental costume, seated while working on an embroidery panel chatting to her attendant. The scene is after the 'Sultan's Wife Embroidering', a painting from 1747 by Charles-André van Loo (1705-1765), framed and glazed, 46.5cm x 51.5cm. Provenance: purchased at J Sparks, London in the late 1960s.