Upon attainment of the desired temperature level, a selected quantity of the reducing agent is introduced into the chamber for producing {HEAD ~ a reducing atmosphere} during {TAIL ~ the maturing} of the ceramic ware 
during
Upon attainment of the desired temperature level , a selected quantity of the reducing agent is introduced into the chamber for producing { HEAD ~ a reducing atmosphere } during { TAIL ~ the maturing } of the ceramic ware
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH