After etching, the workpieces are washed with a mainly neutral washing liquid consisting of a solution of {HEAD ~ the salt} required for {TAIL ~ regeneration} of the etching agent 
After etching , the workpieces are washed with a mainly neutral washing liquid consisting of a solution of { HEAD ~ the salt } required for { TAIL ~ regeneration } of the etching agent
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH