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