Selenium process
Selenium gelatin photogram: see photogram and selenium toning.
Selenium toned gelatin print: See silver gelatin print and selenium toning.
Selenium toned photogram: see photogram and selenium toning.
Selenium toning: A type of toning using the metal selenium to replace silver salts. Used both for the aesthetic benefits of a slightly warmer tone and greatly improved archival properties
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William HELBURN
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