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