| http://www.w3.org/ns/prov#value | - One type of metal-containing bleach catalyst is a catalyst system comprising a transition metal cation of defined bleach catalytic activity,such as copper, iron, titanium, ruthenium, tungsten, molybdenum, or manganese cations, an auxiliary metal cation having little or no bleach catalytic activity, such as zinc or aluminum cations, and a sequestrate having defined stability constants for thecataly
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