Tests have been effected with {HEAD ~ manganese hydroxide Mg2} and other divalent metal ion hydroxides such as iron, cobalt, {TAIL ~ nickel}, copper and zinc are believed to be suitable 
Tests have been effected with { HEAD ~ manganese hydroxide Mg2 } and other divalent metal ion hydroxides such as iron , cobalt , { TAIL ~ nickel } , copper and zinc are believed to be suitable
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH