{HEAD ~ The chemical bath liquid} may be an acid such as HCl, H2 SO4, HNO3, H2 PO3 and HF, or may be an oxidizer or {TAIL ~ base} such as NH4 OH and H2 O2 
be
{ HEAD ~ The chemical bath liquid } may be an acid such as HCl , H2 SO4 , HNO3 , H2 PO3 and HF , or may be an oxidizer or { TAIL ~ base } such as NH4 OH and H2 O2
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 OTH OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH