These ring compounds are maintained in a concentration of between 0.01 and 4.0 grams per {HEAD ~ liter} of {TAIL ~ solution} in the bath 
of
These ring compounds are maintained in a concentration of between 0.01 and 4.0 grams per { HEAD ~ liter } of { TAIL ~ solution } in the bath
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH