In early photographic grayscale developing, sepia toning was achieved by replacing the metallic silver in the emulsion with a silver compound, such as silver sulfide. The resulting prints with their yellowish tone got the name "sepia" after the color of the sepia cuttlefish found in the English Channel. Because of the smell of silver sulphide, sepia toning was often referred to as "rotten egg" toning.
Slide show of Bodie sepia toned photo set
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