A special treatment that gives a black-and-white photo a warmer tone and enhance its archival qualities.
Selenium Toning
The process of converting metallic silver to silver selenide. A diluted selenium toning would be red-brown, but faint; while a strong selenium tone would be a purple-brown tone.
Duotone
Halftone reproduction of an image putting one colors halftone over another color halftone. This brings out the middle tones and highlights of an image.
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