Cliché-verre [Fr.] literally translated means "glass picture' and is a technique that combines art and photography and was used mainly by French artists including Jean Baptiste Corot, Jean François Millet, and Charles François Daubigny. It was normally done by using a smoking candle to coat a glass plate with soot. The desired picture was then drawn with a sharp instrument directly into the blackened surface and the resulting plate was used as a photographic negative and contact printed. Although mainly used in the 1860s the cliché verre technique has also be used by György Kepes and Abelardo Morell.
