Split Blue and Copper Toning Using Color Balance Split toning is a popular darkroom toning technique that is based on the principle that some chemical toners work on the dark tones of the photo first and others on the light tones.
Preparations like Berg's Brown/Copper Toning Solution and Kodak Poly-Toner could produce a range of brown, sepia and even metallic coppery tones, depending on how they were applied.
See also: Time, Digital, Image, Photography, Toner
 
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