By centrally locating the weakened portion 45 {TAIL ~ the liquid reagent} 17 in the second compartment 42 will be directed to the center of {HEAD ~ the first compartment} 41 when the internal seal 43 ruptures 
By centrally locating the weakened portion 45 { TAIL ~ the liquid reagent } 17 in the second compartment 42 will be directed to the center of { HEAD ~ the first compartment } 41 when the internal seal 43 ruptures
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH