A sepia tone 19th century crystoleum
depicting an allegorical scene.
 The crysto was representative of several types of decorative pictures on glass. An albumen print was glued to the inner side of a slightly curved glass, and the paper was removed by soaking, leaving the transparent albumen image on the glass. The image was tinted with oil colours and sealed with wax. A second curved glass was tinted with broad expanses of colour and mounted behind the image; the two glasses were bound together with a separator to give a three dimensional effect.
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