sulfur toning
noun
: any of several processes in which the silver of a printing-out or developed image is caused to combine with sulfur, effecting a change in color and producing a color ranging from a yellowish to a purplish brown compare sulfide toning
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“Sulfur toning.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sulfur%20toning. Accessed 28 Nov. 2024.
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