{TAIL ~ Workpieces} containing copper, {HEAD ~ in particular copper laminated printed circuit boards}, are etched in an alkaline etching agent which contains a copper tetramine complex as the active component 
{ TAIL ~ Workpieces } containing copper , { HEAD ~ in particular copper laminated printed circuit boards } , are etched in an alkaline etching agent which contains a copper tetramine complex as the active component
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH