An Orotone or gold tone is one of many types of photographic print which can be made from a negative. An orotone photograph is created by printing a positive on a glass plate precoated with a silver gelatin emulsion. Following exposure and development, the emulsion is coated with banana oil impregnated with gold colored pigment, to yield a gold-to...
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http://en.wikipedia.org/wiki/Orotone
An image printed on glass then backed in gold; also called gold-tone or curt-tone. It is often found in ornate, molded or gilded frames.
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http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
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