| http://www.w3.org/ns/prov#value | - Particularly preferred is a composition, wherein the reducing agent is a mixture of a cyclic ethylenically unsaturated compound having an allylic hydrogen atom and a phosphorous compound with oxidation number I-IV and a valence of 3 to 5 or a sulfur compound with oxidation number I-IV and a valence of 2 to 4.
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