| http://www.w3.org/ns/prov#value | - In contrast to other heavy metals such as lead, tin, antimony, cadmium, chromium, etc., titanium and zinc compounds are nontoxic as a rule (Sax Toxic Substance Data Book, Shizuo Fujiyama, Maruzen, K. K., 360 S. (cited in EP-A 565,235), see also Rompp
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