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During the 19th century methods were developed for producing black-and-white photographs with the help of light-sensitive silver halides. In the 1890s Gabriel Lippmann discovered a method for color photography based on interference—interaction between light waves. Using a mirror, light was reflected through a photographic emulsion in which the interference phenomenon produces a number of blackened layers. The distance between the layers corresponds to certain wavelengths and can be transmuted into a color image. The method never came into widespread usage, but lived on as a physics experiment.