allowing the second reagent to be absorbed through {HEAD ~ the top layer} of {TAIL ~ the pad} to activate the first reagent by flowing through the rupturable seal after breaking to form an activated chemical test pad in the sealed package 
of
allowing the second reagent to be absorbed through { HEAD ~ the top layer } of { TAIL ~ the pad } to activate the first reagent by flowing through the rupturable seal after breaking to form an activated chemical test pad in the sealed package
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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