| http://www.w3.org/ns/prov#value | - As examples of reducing reagents mention may be made of metals such as magnesium, zinc, aluminum and iron; sulfites, thio-sulfates, thioureas, imidazolinethiones, thiotriazoles, thiopyridines, thio-pyrimidines, thiols, thioacids, sulfoxides, xanthates, orthoand para-polyhydroxy benzenes, aldehydes, and glycols.
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