The conductive material is {HEAD ~ an epoxy cement based conductor}, {TAIL ~ preferably silver}, printed or painted directly on to the substrate 
The conductive material is { HEAD ~ an epoxy cement based conductor } , { TAIL ~ preferably silver } , printed or painted directly on to the substrate
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH