These dyes are suitable for {HEAD ~ use} in thermographic imaging systems wherein the leuco dye is in a composition containing {TAIL ~ a nitrate salt} 
These dyes are suitable for { HEAD ~ use } in thermographic imaging systems wherein the leuco dye is in a composition containing { TAIL ~ a nitrate salt }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL