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