The reagent used for toning in photography is

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(D) In photography,gold toning is a process used to improve the appearance and stability of photographic prints.$AuCl_3$ (Gold$(III)$ chloride) is the

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$AuCl_3$

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(D) In photography,gold toning is a process used to improve the appearance and stability of photographic prints.$AuCl_3$ (Gold$(III)$ chloride) is the reagent commonly used for this purpose.It replaces some of the silver in the image with gold,which provides a warmer tone and increases the archival permanence of the print.

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