Mask of Vaikuntha Vishnu, late 5th century. Learn more about 5th century masks
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A photographic negative produced using a glass plate coated with a light-sensitive emulsion of silver compounds, in use in plate cameras until the early twentieth century. A precursor of the film negative, it took the form of the collodion wet plate method between 1851 and the 1880s, and later, the gelatin dry plate method.