<P> Clayton and Bell . A narrative window with elegant forms and colour which is both brilliant and subtle in its combinations . Peterborough Cathedral </P> <P> In France there was a greater continuity of stained glass production than in England . In the early 19th century most stained glass was made of large panes that were extensively painted and fired, the designs often being copied directly from oil paintings by famous artists . In 1824 the Sèvres porcelain factory began producing stained glass to supply the increasing demand . In France many churches and cathedrals suffered despoliation during the French Revolution . During the 19th century a great number of churches were restored by Viollet - le - Duc . Many of France's finest ancient windows were restored at that time . From 1839 onwards much stained glass was produced that very closely imitated medieval glass, both in the artwork and in the nature of the glass itself . The pioneers were Henri Gèrente and André Lusson . Other glass was designed in a more Classical manner, and characterised by the brilliant cerulean colour of the blue backgrounds (as against the purple - blue of the glass of Chartres) and the use of pink and mauve glass . </P> <Ul> <Li> <P> Detail of a "Tree of Jesse" window in Reims Cathedral designed in the 13th - century style by L. Steiheil and painted by Coffetier for Viollet - le - Duc, (1861) </P> </Li> <Li> <P> St Louis administering Justice by Lobin in the painterly style . (19th century) Church of St Medard, Thouars . </P> </Li> <Li> <P> A brilliantly - coloured window at Cassagnes - Bégonhès, Aveyron </P> </Li> <Li> <P> West window from Saint - Urbain, Troyes, (about 1900) </P> </Li> </Ul> <Li> <P> Detail of a "Tree of Jesse" window in Reims Cathedral designed in the 13th - century style by L. Steiheil and painted by Coffetier for Viollet - le - Duc, (1861) </P> </Li>

What are the stained glass windows in churches called