| http://www.w3.org/ns/prov#value | - A black-and-white developing solution is a solution which contains a reducing agent for silver halides such as aminophenols, polyhydroxybenzenes, for example hydroquinone or hydroquinone derivatives, 3-pyrazolidinones, pyrogallol, pyrocathecol, ascorbic acid or derivatives thereof, etc.
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