| http://www.w3.org/ns/prov#value | - The body acting as activator may either be a compound of-a non-metallic element, 6. g. of titanium, silicon, or an oxid or other suitable compound of a metal, 6. g. of a P metal of the iron group, or of another metal, such as copper or magnesium, or a metal itself, 6. g. of the platinum group, or a mixture of two or more of the said substances.
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