{TAIL ~ The present invention} is concerned with a method of regeneration of spent etching solutions containing {HEAD ~ cupric chloride} and a metal chloride: cuprous chloride or ferrous chloride 
{ TAIL ~ The present invention } is concerned with a method of regeneration of spent etching solutions containing { HEAD ~ cupric chloride } and a metal chloride : cuprous chloride or ferrous chloride
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH