| http://www.w3.org/ns/prov#value | - The additional metal is selected form the group consisting of the main group or the subgroup metals of the periodic table of the elements, preferably form the group of the sub group metals, further preferred from the group of Cu, Ag, Au, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt, particularly preferred from the group of Pd, Pt, Au.
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