a hydrogen sensitive dye disposed in or placed on said container, said hydrogen sensitive dye outputting {HEAD ~ a detectable signal} in {TAIL ~ response} to a presence or absence of said molecular hydrogen 
in
a hydrogen sensitive dye disposed in or placed on said container , said hydrogen sensitive dye outputting { HEAD ~ a detectable signal } in { TAIL ~ response } to a presence or absence of said molecular hydrogen
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH