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