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Photographs produced by mounting a negative (made by a variant of the wet collodion process) that is on glass with a dark backing, which makes the image appear as a positive. Came into wide use in the United States in the early 1850s.
Fotod, mis on valmistatud klaasist negatiivi raamimise teel tumedale aluspõhjale, näitab negatiivi positiivkujutisena. (Negatiiv on valmistatud ühe variandina märg-kolloodiumprotsessist). Tuli Ameerika Ühendriikides laialt kasutusele 1850. aastate alguses.