Most prior art refers to electrolysis of {HEAD ~ the slip liquid} as the primary cause of porosity in {TAIL ~ castings} 
Most prior art refers to electrolysis of { HEAD ~ the slip liquid } as the primary cause of porosity in { TAIL ~ castings }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL