1. Sepia Toning: Sepia toning is a monochrome photographic image in which the picture appears in shades of brown as opposed to the usual greyscale as in a black-and-white images.
2.Selenium Toning: Selenium toning is a popular archival toning process. It converts metallic silver to silver selenide. In a diluted toning solution, selenium toning gives a red-brown tone, while a strong solution gives a purple-brown tone.
3 Duotone: It is an image composed of two colors
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