{TAIL ~ Most preferred bright metal} for {HEAD ~ deposition} is aluminum, though copper, silver and gold may be used 
{ TAIL ~ Most preferred bright metal } for { HEAD ~ deposition } is aluminum , though copper , silver and gold may be used
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH