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