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