collage: a combination or collection of various things
sepia toning: specialized treatment to give a black and white photographic print a warmer tone
selenium toning: archival toning process which converts metallic silver to silver selenide. In a diluted toning, selenium toning gives a red-brown tone, while a strong solution gives a purple-brown tone.
duotone: halftone reproduction of n image using the superimposition of the contrasting color halftone. The most common colors used are blue, yellow, browns, and reds.
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