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