Toning is a traditional darkroom technique - Or workroom technique, as darkness is not essential for the process. Here, the image-forming silver in the processed print is replaced by other metals or compounds to produce a new image tone.
The exact tone resulting from this process depends, in part, on the chemical or metal used and, in part, on the size of the particles produced by the process. Some so-called toners simply divide up the silver particles into tinier fragments in order to produce their effects. Where there is variations in the tone - From red to brown, for example, or from black to silvery grey. this variation in tone is known as split toning and is caused by the toning process proceeding at different rates.
Before
After
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